[PATCH] [LoopVectorize]Teach Loop Vectorizer about interleaved memory access

[Hao Liu]

I think the origin patch is too large, so I've cut the code related to AArch64 backend. The new patch consist of all target independent code. The new patch also fixes a bug about reversed access.

Review please.

Thanks,
-Hao


http://reviews.llvm.org/D9368

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  lib/Analysis/LoopAccessAnalysis.cpp
  lib/Analysis/TargetTransformInfo.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/AArch64/arbitrary-induction-step.ll
  test/Transforms/LoopVectorize/AArch64/interleaved-access.ll

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