llvm

b03d16c8 - [RegisterCoalescer] Fix incorrect VNInfo deletion condition in pruneSubRegValues (#195023)

[RegisterCoalescer] Fix incorrect VNInfo deletion condition in pruneSubRegValues (#195023) Fixes https://github.com/llvm/llvm-project/issues/156249 Guard markUnused in subrange pruning so that only VNInfos defined at the COPY being erased are marked unused, preventing incorrect removal of still-live values in subregister/lane-based intervals. --------- Co-authored-by: Matt Arsenault <arsenm2@gmail.com>