[PATCH] InstCombine: fix fold "fcmp x, undef" to account for NaN

[Mehdi AMINI]

Update thanks to David's review.


http://reviews.llvm.org/D7617

Files:
  include/llvm/IR/Instructions.h
  lib/Analysis/InstructionSimplify.cpp
  lib/IR/ConstantFold.cpp
  test/Transforms/InstCombine/fcmp.ll

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