[PATCH] [FastISel][X86] Assign the correct register class to folded operations

[Keno Fischer]

Ok, have a look at this and let me know what you think. It threads through the InsertPt and then sets the correct register class in foldMemoryOperandImpl. If this approach generally looks fine, I'll split out threading through the InsertPt into a separate commit (since it touches other backends).

http://reviews.llvm.org/D6262

Files:
  include/llvm/CodeGen/MachineInstrBuilder.h
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/TargetInstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  lib/Target/Hexagon/HexagonInstrInfo.cpp
  lib/Target/Hexagon/HexagonInstrInfo.h
  lib/Target/R600/AMDGPUInstrInfo.cpp
  lib/Target/R600/AMDGPUInstrInfo.h
  lib/Target/SystemZ/SystemZInstrInfo.cpp
  lib/Target/SystemZ/SystemZInstrInfo.h
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  test/CodeGen/X86/fast-isel-regclass.ll
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