[PATCH] Add alignment value to allowsUnalignedMemoryAccess

[Matt Arsenault]

Rename to allowsMisalignedMemoryAccess.

On R600, 8 and 16 byte accesses are mostly OK with 4-byte alignment,
and don't need to be split into multiple accesses. Vector loads with
an alignment of the element type are not uncommon in OpenCL code.

http://reviews.llvm.org/D4684

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/ARM/ARMSubtarget.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
  lib/Target/XCore/XCoreISelLowering.cpp
  test/CodeGen/R600/unaligned-load-store.ll
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