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5a7aeaa019
refusing to optimize two memcpy's like this: copy A <- B copy C <- A if it couldn't prove that noalias(B,C). We can eliminate the copy by producing a memmove instead of memcpy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119694 91177308-0d34-0410-b5e6-96231b3b80d8