Capturing backtrace of another thread in engine built with clang raises access violation exception

Engine built with Clang throws an exception when calling RtlVirtualUnwind with a different thread ID. Engines built with Microsoft compilers do not occur this problem.

For example, if starting PIE is blocked for more than 2 seconds, StallDetecter will raise this exception.

1. Build the editor with clang
2. Launch the editor from Visual Studio giving any project and the following command line -ExecCmds="CriticalPathStall.TickStartFrame 2000

Result:

Visual Studio reports an access violation in RtlpUnwindPrologue. see call stack.

Another repro step

1. Build the editor with clang
2. put the following code in any location

   	TArray<uint64> Backtrace;
   	Backtrace.AddUninitialized(100);
   	// Capturing a back trace of another thread
   	int32 NumStackEntries = FPlatformStackWalk::CaptureThreadStackBackTrace(GRenderThreadId, Backtrace.GetData(), Backtrace.Num());
   

1. Launch the editor and execute the code
    

ntdll.dll!RtlpUnwindPrologue()    Unknown
ntdll.dll!RtlpxVirtualUnwind()    Unknown
ntdll.dll!RtlVirtualUnwind()    Unknown
kernel32.dll!RtlVirtualUnwindStub()    Unknown
UnrealEditor-Core-Win64-Debug.dll!FMicrosoftPlatformStackWalk::CaptureStackTraceInternal(unsigned __int64 * OutBacktrace, unsigned int MaxDepth, void * InContext, void * InThreadHandle, unsigned int * OutDepth) Line 120    C++
UnrealEditor-Core-Win64-Debug.dll!FWindowsPlatformStackWalk::CaptureStackTraceByProcess(unsigned __int64 * OutBacktrace, unsigned int MaxDepth, void * InContext, void * InThreadHandle, unsigned int * OutDepth, bool bExternalProcess) Line 280    C++
UnrealEditor-Core-Win64-Debug.dll!FWindowsPlatformStackWalk::CaptureThreadStackBackTrace(unsigned __int64 ThreadId, unsigned __int64 * BackTrace, unsigned int MaxDepth, void * Context) Line 344    C++
UnrealEditor-Core-Win64-Debug.dll!UE::FStallDetectorRunnable::Run() Line 155    C++
UnrealEditor-Core-Win64-Debug.dll!FRunnableThreadWin::Run() Line 146    C++
kernel32.dll!BaseThreadInitThunk()    Unknown
ntdll.dll!RtlUserThreadStart()    Unknown

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