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This patch adds support for vector constant folding of integer/float comparisons. This requires FoldConstantVectorArithmetic to support scalar constant operands (in this case ISD::CONDCASE). In future we should be able to support other scalar constant types as necessary (and possibly start calling FoldConstantVectorArithmetic for all node creations) Differential Revision: http://reviews.llvm.org/D14683 llvm-svn: 253504