[PATCH] R600/SI: Try to use scalar BFE.

[Matt Arsenault]

Use scalar BFE with constant shift and offset when possible.
This is complicated by the fact that the scalar version packs
the two operands of the vector version into one.


http://llvm-reviews.chandlerc.com/D3249

Files:
  lib/Target/R600/AMDGPUISelDAGToDAG.cpp
  lib/Target/R600/SIInstrInfo.cpp
  test/CodeGen/R600/sext-in-reg.ll
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