[llvm-branch-commits] [llvm] [PHIElimination] Reuse existing COPY in predecessor basic block (Take Two) (PR #146806)

[Mikael Holmén via llvm-branch-commits]

mikaelholmen wrote:

> @mikaelholmen @mstorsjo @macurtis-amd @sjoerdmeijer @sushgokh We've decided that it's best to revert the original PR (see #146850), sorry for wasting your time. This PR is trying to reintroduce it with fixes to the issues you've presented. Can I humbly ask you to test this commit one final time?

I've re-tested the cases I've reported problems for with this patch on top of our downstream compiler based on trunk version c79fcfee41 and they still work.

https://github.com/llvm/llvm-project/pull/146806