[clang-tools-extra] [llvm] [openmp] [lldb] [libcxx] [compiler-rt] [libcxxabi] [flang] [clang] [mlir] [MachineCopyPropagation] When the source of PreviousCopy is undef, we cannot replace sub register (PR #74682)

[via cfe-commits]

https://github.com/DianQK converted_to_draft 
https://github.com/llvm/llvm-project/pull/74682
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