[PATCH] LegalizeDAG: Try to use Overflow operations when expanding ADD/SUB

[Jan Vesely]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6340

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  llvm/trunk/test/CodeGen/Hexagon/adde.ll
  llvm/trunk/test/CodeGen/Hexagon/sube.ll
  llvm/trunk/test/CodeGen/NVPTX/add-128bit.ll
  llvm/trunk/test/CodeGen/R600/sub.ll

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