[PATCH] propagate IR-level fast-math-flags to DAG nodes

[Sanjay Patel]

Patch updated:

1. Corrected DAGCombiner 'arcp' optimization to only trigger for the reassociation division case, not the estimate cases.
2. Updated PowerPC test case that uses that optimization (x86 still doesn't have it); worked around PR23172 by putting the 'arcp' versions of the tests before the unsafe-fp-math versions.


http://reviews.llvm.org/D8900

Files:
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/CodeGen/SelectionDAGNodes.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/PowerPC/fdiv-combine.ll

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