[PATCH] Add address space argument to allowsUnalignedMemoryAccess.

[Matt Arsenault]

On R600, some address spaces have more strict alignment requirements than others.

Updating the uses to pass the address space will be a separate patch.

http://llvm-reviews.chandlerc.com/D2522

Files:
  include/llvm/Target/TargetLowering.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/Mips/Mips16ISelLowering.cpp
  lib/Target/Mips/Mips16ISelLowering.h
  lib/Target/Mips/MipsSEISelLowering.cpp
  lib/Target/Mips/MipsSEISelLowering.h
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIISelLowering.h
  lib/Target/SystemZ/SystemZISelLowering.cpp
  lib/Target/SystemZ/SystemZISelLowering.h
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
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