if (EventSource.Log.IsEnabled() && someBoolean) not being trimmed properly

Given the code pattern:
```C#
if (SomeEventSource.Log.IsEnabled())
{
Foo();
}
```
the call to Foo() will be properly removed when trimming of event sources is enabled. However, given the code pattern:
```C#
bool something = ...;
...
if (SomeEventSource.Log.IsEnabled() && something)
{
Foo();
}
```
the call to Foo() is _not_ getting trimmed out.

Repro:
1. Create a new Blazor wasm app.
2. Add:
```



link

```
to the .csproj.
3. Add:
```C#
class MyEventSource : EventSource
{
public static MyEventSource Log { get; } = new MyEventSource();
}
```
to the Program.cs file.
4. Change the main method to have:
```C#
if (MyEventSource.Log.IsEnabled() && something)
{
Console.WriteLine("still here?");
}
```
at the end.
5. dotnet publish -c Release

The Console.WriteLine call remains in the built binary. If you then remove the `&& something` clause, the Console.WriteLine call is stripped out.

cc: @marek-safar, @eerhardt