[PATCH] [CodeGen] Don't blindly combine (fp_round (fp_round x)) to (fp_round x).

[Ahmed Bougacha]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7571

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/AArch64/f16-convert.ll
  llvm/trunk/test/CodeGen/X86/fp-double-rounding.ll

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