[PATCH] R600: Bug 20982 - Avoid undefined left shift of negative value

[Matt Arsenault]

I'm not sure what the hardware actually does, so don't bother trying to fold it for now.

http://reviews.llvm.org/D5388

Files:
  lib/Target/R600/AMDGPUISelLowering.cpp
  test/CodeGen/R600/llvm.AMDGPU.bfe.i32.ll
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