[PATCH] optimize vector fneg of bitcasted integer value

[Sanjay Patel]

Fixed FileCheck prefixes for ARM testcase.

http://reviews.llvm.org/D4852

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/2009-10-21-InvalidFNeg.ll
  test/CodeGen/ARM/fnegs.ll
  test/CodeGen/X86/vec_fneg.ll
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