[PATCH] Refactor LowerFABS and LowerFNEG into one function (x86) (NFC)

[Sanjay Patel]

Updated patch because http://reviews.llvm.org/D5052 was checked in at r216889. Also updated some comments.

http://reviews.llvm.org/D5064

Files:
  lib/Target/X86/X86ISelLowering.cpp
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