Debugger: 'Main Thread' detection doesn't exist on Linux/Mac

[ClaireKang]

dotnet --info output:
VS Code version: 1.9.1
C# Extension version: 1.7.0
OS: Windows 10 Enterprise Insider Preview
Build: 15032.1000.AMD64FRE.RS_ONECORE_BASE_BPT1.170207-1700_CLIENT_ENTERPRISE_EN-US_VL.VHDX
Scenarios: WSL Pipe

Steps to reproduce

1. Open attached folder.
   app1.zip

2. Copy the code from Windows with the command "cp /mnt/c/temp/app1/Program.cs ." in "Bash on Ubuntu on Windows" window.

3. dotnet build & dotnet run.

4. Set the bp in the line 'Console.WriteLine("Hello world");'.

5. Select 'Pipe Attach'.

6. F5 to start debugging.

Expected behavior

Actual behavior

[rajkumar42]

In non-windows platforms, "Main Thread" is not named.