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c41b4b6397
Instead of unsetting flags on the instruction, attempting the fold, and the resetting the flags if it failed, add support to simplifyWithOpReplaced() to ignore poison-generating flags/metadata and collect all instructions where they may need to be dropped. This allows us to perform the fold a) with poison-generating metadata, which was previously not handled and b) poison-generating flags/metadata that are not on the root instruction. Proof for the ctpop case: https://alive2.llvm.org/ce/z/3H3HFs Fixes https://github.com/llvm/llvm-project/issues/62450.
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