[PATCH] [Windows] Implementing backtracing of self

[Zachary Turner]

I found a problem with my initial implementation.  MSDN says that on x64, a full CONTEXT structure is required.  So this patch was broken for x64.  Luckily I learned of a new function which I was previously unaware of, RtlCaptureContext().  It captures a context for the current thread which is exactly what we need.  This patch is updated to reflect these changes, and we now no longer require setjmp.

Will commit this tomorrow.


http://reviews.llvm.org/D8068

Files:
  lib/Support/Windows/Signals.inc

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