[llvm] [AMDGPU][True16] added Pre-RA hint to improve copy elimination (PR #103366)

[Brox Chen via llvm-commits]

broxigarchen wrote:

Not sure why this hit the buildbot as I just rebased and update the patch. I guess I might be unlucky that some other PR just get merged before I merge this.

Working on getting up a fix

https://github.com/llvm/llvm-project/pull/103366