[PATCH] Fix fcmp + fabs instcombines when using the intrinsic

[Matt Arsenault]

This was only handling the libcall. This is another example
of why only the intrinsic should ever be used when it exists.

http://reviews.llvm.org/D6323

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/fcmp.ll
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