[PATCH] X86: Emit an ABI compliant prologue and epilogue for Win64

[David Majnemer]

- Address rnk's review feedback.


http://reviews.llvm.org/D7520

Files:
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/X86/gcc_except_table.ll
  test/CodeGen/X86/win64_alloca_dynalloca.ll
  test/CodeGen/X86/win64_alloca_dynalloca.s
  test/CodeGen/X86/win64_eh.ll
  test/CodeGen/X86/win64_eh.s
  test/CodeGen/X86/win64_frame.ll

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