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This patch modifies SelectionDAGBuilder to construct SDNodes with associated NoSignedWrap, NoUnsignedWrap and Exact flags coming from IR BinaryOperator instructions. Added a new SDNode type called 'BinaryWithFlagsSDNode' to allow accessing nsw/nuw/exact flags during codegen. Patch by Marcello Maggioni. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210467 91177308-0d34-0410-b5e6-96231b3b80d8