llvm-project

5d2e2847 - MachineCopyPropagation: Do not remove copies preserved by regmask (#125868)

MachineCopyPropagation: Do not remove copies preserved by regmask (#125868) llvm/llvm-project@9e436c2daa44 tries to handle register masks and sub-registers, it avoids clobbering RegUnit presreved by regmask. But it then introduces invalid pointer issues. We delete the copies without invalidate all the use in the CopyInfo, so we dereferenced invalid pointers in next interation, causing asserts. Fixes: #126107 --------- Co-authored-by: Matt Arsenault <arsenm2@gmail.com>