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

[Sanjay Patel]

Hi majnemer, chandlerc, nadav,

We duplicate ~30 lines of code to lower FABS and FNEG for x86, so I've combined them into one function. No functional change intended, so no additional test cases. Test-suite behavior is unchanged.

This is a follow-on patch to http://reviews.llvm.org/D5052 (use an integer constant for FABS / FNEG (x86)). 

If this patch is OK, we can abandon the other patch because that change is included here.

http://reviews.llvm.org/D5064

Files:
  lib/Target/X86/X86ISelLowering.cpp
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