[PATCH] Combine a setcc->select->setcc->select chain with constants into setcc->select

[Justin Holewinski]

For certain patterns of constants within setcc->select->setcc chains, we can
simplify the generated DAG by forwarding the values of the constants.

Patch by Okwan Kwon <okwank at nvidia.com>

http://llvm-reviews.chandlerc.com/D2373

Files:
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  test/CodeGen/NVPTX/setcc-select-setcc.ll
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