[PATCH] Combine fcmp + select to fminnum / fmaxnum if no nans and legal

[Matt Arsenault]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6744

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/R600/fmax_legacy.ll
  test/CodeGen/R600/fmin_legacy.ll

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