efe4e7a026
SCEV currently preserves the nsw flag when performing an nsw multiply of an nsw addrec. While this is legal for nuw, this is not generally the case for nsw. This is because nsw mul does not distribute over nsw add: https://alive2.llvm.org/ce/z/mergCt Instead, we need either both nuw and nsw to be set (https://alive2.llvm.org/ce/z/7wpgGc) or explicitly prove that the distributed multiplications are also nsw (https://alive2.llvm.org/ce/z/wef9su). Fixes https://github.com/llvm/llvm-project/issues/66066.