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We hit undefined behaviour in some MCExpr tests when the LHS of a left shift is -1. Twos-complement semantics are completely reasonable here, so we should just do the shift in unsigned. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240385 91177308-0d34-0410-b5e6-96231b3b80d8