[PATCH] AArch64: Fold immediate into the immediate field of logical instructions

[Akira Hatanaka]

Rewrote the algorithm for searching for a bitmask immediate based on Tim's feedback.

http://reviews.llvm.org/D5591

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