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d8e448bd27
'shl nuw CI, x' produces [CI, CI << CLZ(CI)] 'shl nsw CI, x' produces [CI << CLO(CI)-1, CI] if CI is negative 'shl nsw CI, x' produces [CI, CI << CLZ(CI)-1] if CI is non-negative git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216570 91177308-0d34-0410-b5e6-96231b3b80d8