[PATCH] [AArch64] Implement allowsUnalignedMemoryAccesses()

[Z. Zheng]

Hi Jiangning, t.p.northover,

This patch enables unaligned memory accesses of vector types on AArch64 back end. This should boost vectorized code performance.

http://reviews.llvm.org/D3319

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AArch64/AArch64Subtarget.cpp
  lib/Target/AArch64/AArch64Subtarget.h
  test/CodeGen/AArch64/unaligned-vector-ld1-st1.ll
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