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

[Akira Hatanaka]

Sorry for not updating the patch for a long time. Here is my new patch.

For the most part, the new patch takes the same approach as the previous patch to find an immediate operand, but there were a couple of changes made.

- Function optimizeLogicalImm emits AArch64 machine nodes to prevent the target-independent dagcombine from undoing the optimization. With this change, there is no need to make changes in DAGCombiner::visitOR as I did in my previous patch.
- In optimizeLogicalImm, rotation is used to avoid using branches and simplify the logic.
- A target-specific function object for optimizing nodes with immediates is passed to the constructor of TargetLoweringOpt, which gets called later in TargetLoweringOpt::ShrinkDemandedConstant.


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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