[PATCH] use an integer constant for FABS / FNEG (x86)

[Sanjay Patel]

This patch is just a bit of cleanup to ease refactoring LowerFABS() and LowerFNEG() since they have a lot of overlap. 

I've removed the creation of a floating point constant from an integer because it's going to be used for a bitwise integer op anyway. 

I don't intend for this to make any difference to codegen, and AFAICT there isn't. There's no difference in test-suite either.

http://reviews.llvm.org/D5052

Files:
  lib/Target/X86/X86ISelLowering.cpp
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