Windows ASan GetProcAddress replacement

[David Major via llvm-commits]

On Windows, it's not possible to hook malloc using
GetProcAddress(...,"malloc") because the GetProcAddress API will run the
target DLL's initialize routine, which can cause mallocs to happen
before the hook is installed. This was observed in
https://llvm.org/bugs/show_bug.cgi?id=24237#c2.

This patch adds a GetProcAddress replacement that manually walks the
target library's export table, without calling the initialization
routine.

(A large part of this is taken from Mozilla code at
https://hg.mozilla.org/mozilla-central/file/tip/toolkit/xre/WindowsCrtPatch.h.
I hope that's okay license-wise.)
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