Evaluating `Span<T>` variable while stepping over stackalloc crashes target process

## Issue Description ##

I've got a line in a csharp program I'm writing that looks like:

```csharp
Span mib = stackalloc int[3];
```

When I step into or over it in the debugger, if I'm not fast enough, the debugger and program being debugged will crash. It looks like a native crash, where there's no error message or indication of failure. The debugger just goes down along with the program being debugged in the terminal and VSCode is left waiting for the step to complete.

## Steps to Reproduce ##

Put something like:

```csharp
Span mib = stackalloc int[3];
```

in a program and place a breakpoint before it (possibly on it) and step into it.

## Expected Behavior ##

It allows stepping to continue (I don't need it to show up or anything -- I know `stackalloc` is new and niche -- just want to be able to continue).

## Actual Behavior ##

Debugger silently crashes.

## Logs ##

### OmniSharp log ###

Starting OmniSharp server at 12/07/2019, 10:36:34 am
Target: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/PowerShell.sln

OmniSharp server started.
Path: /Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/run
PID: 8457

[info]: OmniSharp.Stdio.Host
Starting OmniSharp on MacOS 10.14.5 (x64)
[info]: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 1 MSBuild instance(s)
1: StandAlone 15.0 - "/Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/omnisharp/.msbuild/Current/Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
MSBUILD_EXE_PATH environment variable set to '/Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/omnisharp/.msbuild/Current/Bin/MSBuild.dll'
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: StandAlone 15.0 - "/Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/omnisharp/.msbuild/Current/Bin"
MSBuildExtensionsPath = /Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/omnisharp/.msbuild
BypassFrameworkInstallChecks = true
CscToolPath = /Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/omnisharp/.msbuild/Current/Bin/Roslyn
CscToolExe = csc.exe
MSBuildToolsPath = /Users/rjmholt/.vscode-insiders/extensions/ms-vscode.csharp-1.20.0/.omnisharp/1.32.20/omnisharp/.msbuild/Current/Bin
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Detecting Cake files in '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell'.
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Could not find any Cake files
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Project system 'OmniSharp.DotNet.DotNetProjectSystem' is disabled in the configuration.
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Detecting projects in '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/PowerShell.sln'.
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Queue project update for '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/powershell-win-core/powershell-win-core.csproj'
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Queue project update for '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.Management.Infrastructure.CimCmdlets/Microsoft.Management.Infrastructure.CimCmdlets.csproj'
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Queue project update for '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Diagnostics/Microsoft.PowerShell.Commands.Diagnostics.csproj'
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Queue project update for '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.WSMan.Management/Microsoft.WSMan.Management.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Queue project update for '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Security/Microsoft.PowerShell.Security.csproj'
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Queue project update for '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/test/xUnit/xUnit.tests.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell'.
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/powershell-win-core/powershell-win-core.csproj
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Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[info]: OmniSharp.WorkspaceInitializer
Configuration finished.
[info]: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell' on host 8424.
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/powershell-win-core/powershell-win-core.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/powershell-win-core/powershell-win-core.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/System.Management.Automation/System.Management.Automation.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/System.Management.Automation/System.Management.Automation.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/System.Management.Automation/System.Management.Automation.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Utility/Microsoft.PowerShell.Commands.Utility.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Utility/Microsoft.PowerShell.Commands.Utility.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Utility/Microsoft.PowerShell.Commands.Utility.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.CoreCLR.Eventing/Microsoft.PowerShell.CoreCLR.Eventing.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.CoreCLR.Eventing/Microsoft.PowerShell.CoreCLR.Eventing.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.CoreCLR.Eventing/Microsoft.PowerShell.CoreCLR.Eventing.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.ConsoleHost/Microsoft.PowerShell.ConsoleHost.csproj
[info]: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.ConsoleHost/Microsoft.PowerShell.ConsoleHost.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.ConsoleHost/Microsoft.PowerShell.ConsoleHost.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Management/Microsoft.PowerShell.Commands.Management.csproj
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Successfully loaded project file '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Management/Microsoft.PowerShell.Commands.Management.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Management/Microsoft.PowerShell.Commands.Management.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
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Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.SDK/Microsoft.PowerShell.SDK.csproj'
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Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.Management.Infrastructure.CimCmdlets/Microsoft.Management.Infrastructure.CimCmdlets.csproj
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[info]: OmniSharp.MSBuild.ProjectManager
Adding project '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.Management.Infrastructure.CimCmdlets/Microsoft.Management.Infrastructure.CimCmdlets.csproj'
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Loading project: /Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Diagnostics/Microsoft.PowerShell.Commands.Diagnostics.csproj
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Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.Management.Infrastructure.CimCmdlets/bin/Debug/netcoreapp3.0/Microsoft.Management.Infrastructure.CimCmdlets.dll'
[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Diagnostics/bin/Debug/netcoreapp3.0/Microsoft.PowerShell.Commands.Diagnostics.dll'
[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.WSMan.Management/bin/Debug/netcoreapp3.0/Microsoft.WSMan.Management.dll'
[info]: OmniSharp.MSBuild.ProjectManager
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[info]: OmniSharp.MSBuild.ProjectManager
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[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.WSMan.Runtime/bin/Debug/netcoreapp3.0/Microsoft.WSMan.Runtime.dll'
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[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.Management.Infrastructure.CimCmdlets/bin/Debug/netcoreapp3.0/Microsoft.Management.Infrastructure.CimCmdlets.dll'
[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.PowerShell.Commands.Diagnostics/bin/Debug/netcoreapp3.0/Microsoft.PowerShell.Commands.Diagnostics.dll'
[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.WSMan.Management/bin/Debug/netcoreapp3.0/Microsoft.WSMan.Management.dll'
[warn]: OmniSharp.MSBuild.ProjectManager
Unable to resolve assembly '/Users/rjmholt/Documents/Dev/Microsoft/PowerShell/src/Microsoft.WSMan.Runtime/bin/Debug/netcoreapp3.0/Microsoft.WSMan.Runtime.dll'
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
powershell-unix: Did not find 'runtime.linux-x64.Microsoft.NETCore.App' in lock file.
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powershell-unix: Did not find 'runtime.osx-x64.Microsoft.NETCore.App' in lock file.
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powershell-unix: Did not find 'runtime.osx-x64.Microsoft.NETCore.DotNetHostResolver' in lock file.
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powershell-unix: Did not find 'runtime.osx-x64.Microsoft.NETCore.DotNetHostPolicy' in lock file.
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powershell-unix: Did not find 'Microsoft.AspNetCore.App.Runtime.linux-x64' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
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xUnit.tests: Did not find 'runtime.osx-x64.Microsoft.NETCore.DotNetHostPolicy' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'runtime.linux-x64.Microsoft.NETCore.App' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'runtime.linux-x64.Microsoft.NETCore.DotNetHostResolver' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'runtime.linux-x64.Microsoft.NETCore.DotNetHostPolicy' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'runtime.win-x86.Microsoft.WindowsDesktop.App' in lock file.
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xUnit.tests: Did not find 'runtime.win-x64.Microsoft.WindowsDesktop.App' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'Microsoft.AspNetCore.App.Runtime.win-x86' in lock file.
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xUnit.tests: Did not find 'Microsoft.AspNetCore.App.Runtime.osx-x64' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'Microsoft.AspNetCore.App.Runtime.linux-x64' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'Microsoft.NETCore.App.Host.win-x86' in lock file.
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xUnit.tests: Did not find 'Microsoft.NETCore.App.Host.win-x64' in lock file.
[warn]: OmniSharp.MSBuild.PackageDependencyChecker
xUnit.tests: Did not find 'Microsoft.NETCore.App.Host.linux-x64' in lock file.

### C# log ###
(None)

## Environment information ##

**VSCode version**: 1.34.0-insider
**C# Extension**: 1.20.0

Mono Information
OmniSharp using built-in mono
Dotnet Information
.NET Core SDK (reflecting any global.json):
Version: 3.0.100-preview5-011568
Commit: b487ff10aa

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.14
OS Platform: Darwin
RID: osx.10.14-x64
Base Path: /Users/rjmholt/.dotnet/sdk/3.0.100-preview5-011568/

Host (useful for support):
Version: 3.0.0-preview5-27626-15
Commit: 61f30f5a23

.NET Core SDKs installed:
2.1.504 [/Users/rjmholt/.dotnet/sdk]
2.2.104 [/Users/rjmholt/.dotnet/sdk]
3.0.100-preview5-011568 [/Users/rjmholt/.dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.8 [/Users/rjmholt/.dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.2 [/Users/rjmholt/.dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.8 [/Users/rjmholt/.dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.2 [/Users/rjmholt/.dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.0.0-preview5-19227-01 [/Users/rjmholt/.dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.8 [/Users/rjmholt/.dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.2 [/Users/rjmholt/.dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0-preview5-27626-15 [/Users/rjmholt/.dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
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Visual Studio Code Extensions

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