[PATCH] [Support] Lazy load of dbghlp.dll on Windows

[Leny Kholodov]

In http://reviews.llvm.org/D10737#195096, @zturner wrote:

> Why not just make it delay load dll instead of all the LoadLibrary stuff?


This was done for supporting mingw distributions without 64-bit versions of the DebugHlp APIs (please, see lib/Support/Windows/Signals.inc line 49 and below). Existing code base has already implemented dll loading part for some cases so I have prepared the patch as close to current implementation as possible.


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