[llvm-branch-commits] [llvm] [AMDGPU] start using new pass manager for backend codegen (PR #210251)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 requested changes to this pull request.

This is still not ready until we fix any regressions with LSR taking in LCSSA IR and ideally switch the LegacyPM over to taking in LCSSA IR as well to be consistent.

https://github.com/llvm/llvm-project/pull/210251