[PATCH] Refactor and enhance FMA combine

[Olivier Sallenave]

Thanks for those useful comments! I incorporated them and also refactored the separate functions. I think the behavior regarding whether we should choose FMAD or FMA is clearer now. Tell me what you think.

Olivier


http://reviews.llvm.org/D8050

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/PowerPC/fma-assoc.ll
  test/CodeGen/PowerPC/fma-ext.ll

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