[PATCH] MC: Add support for .cfi_startproc simple

[David Majnemer]

Hi rafael, void,

This commit allows LLVM MC to process .cfi_startproc directives when
they are followed by an additional `simple' identifier.  This signals to
elide the emission of target specific CFI instructions that would
normally occur initially.

http://llvm-reviews.chandlerc.com/D2624

Files:
  include/llvm/MC/MCDwarf.h
  include/llvm/MC/MCStreamer.h
  lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
  lib/MC/MCAsmStreamer.cpp
  lib/MC/MCDwarf.cpp
  lib/MC/MCParser/AsmParser.cpp
  lib/MC/MCStreamer.cpp
  test/MC/ELF/cfi.s
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