[PATCH] R600: Better fix for bug 20982

[Matt Arsenault]

Just do the left shift as unsigned to avoid the UB.

http://reviews.llvm.org/D5398

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