[PATCH] [CodeGenPrepare] Move extractelement close to store if they can be combined.

[Quentin Colombet]

- Check whether or not the store to be combined is properly aligned.

http://reviews.llvm.org/D5921

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  test/CodeGen/ARM/vector-promotion.ll
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