[llvm] AMDGPU: Fix temporal divergence introduced by machine-sink and performance regression introduced by D155343 (PR #67456)

[via llvm-commits]

petar-avramovic wrote:

Updated version that does not allow sink. I tried to implement lightweight temporal divergence detection if machine-uniformity-analysis looks too expensive. ToDo remove blockPrologueInterferes

https://github.com/llvm/llvm-project/pull/67456