[PATCH] R600: Fix miscompiles when BFE has multiple uses

[Matt Arsenault]

SimplifyDemandedBits would break the other uses of the operand.

http://reviews.llvm.org/D5790

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  test/CodeGen/R600/llvm.AMDGPU.bfe.u32.ll
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