[PATCH] Generate SEH unwinding info on Win64

[Vadim Chugunov]

Whoops, looks like I got .cfi_offset and .cfi_rel_offset mixed up.  The original offsets in bigstructret2.ll test were actually correct.
Also, rebased on top of master.

http://reviews.llvm.org/D4081

Files:
  include/llvm/CodeGen/MachineFrameInfo.h
  lib/CodeGen/AsmPrinter/Win64Exception.cpp
  lib/CodeGen/MachineFunction.cpp
  lib/CodeGen/PrologEpilogInserter.cpp
  lib/MC/MCObjectFileInfo.cpp
  lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrCompiler.td
  lib/Target/X86/X86MCInstLower.cpp
  test/CodeGen/X86/2007-05-05-Personality.ll
  test/CodeGen/X86/2009-06-03-Win64SpillXMM.ll
  test/CodeGen/X86/avx-intel-ocl.ll
  test/CodeGen/X86/gcc_except_table.ll
  test/CodeGen/X86/win64_eh.ll
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