[PATCH] Added a size field to the stack map record to handle subregister spills.

[Andrew Trick]

  Incorporate Jakob's comments.

  The little-endian check was my misunderstanding Jakob's initial suggestion. I like this way better though.

  The rest are all in the "what was I thinking" category.

  I also updated the stackmap test cases and added on for a subregister spill.

Hi ributzka, lhames,

http://llvm-reviews.chandlerc.com/D2189

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2189?vs=5582&id=5583#toc

Files:
  include/llvm/CodeGen/StackMaps.h
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/InlineSpiller.cpp
  lib/CodeGen/StackMaps.cpp
  lib/CodeGen/TargetInstrInfo.cpp
  lib/Target/X86/X86AsmPrinter.h
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86MCInstLower.cpp
  test/CodeGen/X86/anyregcc.ll
  test/CodeGen/X86/stackmap.ll
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