[PATCH] Fix failure to invoke exception handler on Win64.

[Vadim Chugunov]

Hi rnk,

Fixes an obscure Win64 unwinding failure which I've stumbled upon.  Please see comments for details.
MSVC does the same, btw.

http://reviews.llvm.org/D4751

Files:
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/X86/win64_call_epi.ll
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