[llvm] [AMDGPU] VGPR instruction placement should be aware of exec mask prol… (PR #175080)

[Christudasan Devadasan via llvm-commits]

https://github.com/cdevadas commented:

Introducing another target hook while retaining `isBasicBlockPrologue` would increase the complexity further. This approach doesn't seem like a favorable one for addressing our problem.

https://github.com/llvm/llvm-project/pull/175080