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8956cdfa58
Currently ArgPromotion removes dead GEPs as part of the legality check in isSafeToPromoteArgument. If no promotion happens, this means the pass claims no modifications happened, even though GEPs were removed. This patch fixes the issue by delaying removal of dead GEPs until doPromotion: isSafeToPromoteArgument can simply skips dead GEPs and the code in doPromotion dealing with GEPs is updated to account for dead GEPs. Once we committed to promotion, it should be safe to remove dead GEPs. Alternatively isSafeToPromoteArgument could return an additional boolean to indicate whether it made changes, but this is quite cumbersome and there should be no real benefit of weeding out some dead GEPs here if we do not perform promotion. I added a test for the case where dead GEPs need to be removed when promotion happens in 578c5a0c6e71. Fixes PR47477. Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D93991