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3b0d269398
Extend the existing lowering of vXi8 multiplies to support v64i8 on avx512bw targets. I added the Lower512IntArith helper function to help with this - not sure how often this could be used in the future, but it seemed better than putting all that logic inside LowerMUL. Differential Revision: http://reviews.llvm.org/D18937 llvm-svn: 265902
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