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

[Sanjay Patel]

Patch updated:

1. We hacked off the head of this patch into http://reviews.llvm.org/D9325 ( http://reviews.llvm.org/rL235997 ) - move the flags into their own space.
2. I've also removed the tail end of this patch; that's just the part that recognizes 'arcp' and optimizes based on it in DAGCombiner.

So this patch is now NFC-intended, but there are 2 structural changes:

1. The main diff is that we're preparing to expand the reach of the optimization flags to affect more than just binary SDNodes. I think this is already necessary for intrinsics in IR ( PR21290 - https://llvm.org/bugs/show_bug.cgi?id=21290 ). And now that we have the flags in the backend, we can propagate them to non-binop nodes that don't even exist in IR such as FMA, FNEG, etc.
2. The other change is that we're actually copying the FP fast-math-flags from the IR instructions to SDNodes. They're just not being used for anything yet...that's the next patch.


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

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