[PATCH] [AArch64] Lower sdiv x, pow2 using add + select + shift.

[Chad Rosier]

Revised version with proposed BuildSDIVPow2 API.  Please have a look.

 Chad

http://reviews.llvm.org/D4438

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  test/CodeGen/AArch64/sdivpow2.ll
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