[PATCH] propagate IR-level fast-math-flags to DAG nodes, disabled by default

[Sanjay Patel]

Hi nlewycky,

This is an updated version of the patch that was checked in at:
http://reviews.llvm.org/rL237046

but subsequently reverted because it exposed the bug in:
http://reviews.llvm.org/D9893

This time I've put an enablement flag ("EnableFMFInDAG") around the code in SelectionDAGBuilder where we copy the set of FP optimization flags from IR instructions to DAG nodes. So, in theory, there should be no functional change from this patch as-is, but it will allow testing with the added functionality to proceed via "-enable-fmf-dag" passed to llc. So for example the testcase in D9893 should be fine by default and crash with FMF enabled.

This patch is derived from part of D8900.

http://reviews.llvm.org/D10403

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

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