[PATCH] [AArch64] Change default legalization behavior of v1i32 to be widen to v2i32 instead of scalarization

[Hao Liu]

Hi Tim,

Your suggestion is very good.
I've refactored the patch by using one hook to control all the legalization actions.

Thanks,
-Hao

http://reviews.llvm.org/D4322

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/TargetLoweringBase.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/NVPTX/NVPTXISelLowering.cpp
  lib/Target/NVPTX/NVPTXISelLowering.h
  lib/Target/R600/SIISelLowering.cpp
  lib/Target/R600/SIISelLowering.h
  test/CodeGen/AArch64/arm64-neon-copy.ll
  test/CodeGen/AArch64/arm64-neon-select_cc.ll
  test/CodeGen/AArch64/trunc-v1i64.ll
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