[llvm] [AMDGPU] - Fix non-deterministic compile issue (PR #126271)

[Jeffrey Byrnes via llvm-commits]

https://github.com/jrbyrnes approved this pull request.

> There's an iteration over RematDefToLiveInRegions in sinkTriviallyRematInsts - which pre-dates the changes in https://github.com/llvm/llvm-project/pull/124327
> My assumption is that the change enabled more rematerialization - and that's highlighted this pre-existing issue that probably didn't trigger very often before.

This is correct -- thanks

https://github.com/llvm/llvm-project/pull/126271