Debugger doesn't support debugging x86 processes on x64 Windows

## Environment data
`dotnet --info` output:
.NET Command Line Tools (1.0.4)

Product Information:
Version: 1.0.4
Commit SHA-1 hash: af1e6684fd
Runtime Environment:
OS Name: Windows
OS Version: 6.1.7601
OS Platform: Windows
RID: win7-x64
Base Path: C:\Program Files\dotnet\sdk\1.0.4

VS Code version:
1.15.0

C# Extension version:
1.12.1

## Steps to reproduce
1. dotnet new mvc -o projname
2. cd projname
3. code . (start vscode)
4. change netcoreapp1.1 to net452 in projname.csproj
5. run: dotnet restore
6. ctrl+shft+d (opens debug)
7. Hit F5 (start debug) -> Choose .Net Core to create a launch.json
8. In launch.json change to net452
and .dll to projname.exe
9. Hit F5 again -> Click open Configure Task Runner -> Choose .Net Core
10. In tasks.json Change "command": "dotnet build", -> "command": ""dotnet build '${workspaceRoot}/projname.csproj'\"",
11. Set a Breakpoint and Hit F5 again
11. Popup showing "Only 64-bit processes can be debugged."

## Expected behavior
Should start debugging and hit breakpoints

## Actual behavior
Only shows the error message and stops

If i change the to netcoreapp1.1 in projname.csproj
and in launch.json change to netcoreapp1.1
and .dll to projname.dll the debbuging works and the breakpoints are hit.
I checked the projname.dll that netcoreapp1.1 produced and the projname.exe that the net452 produced. And they are both in x86.

Am i doing something wrong, have something installed incorrectly or is this the expected behaviour?