[llvm] [AMDGPU] Add shuffle optimizer pass (PR #155824)

[Aleksandar Spasojevic via llvm-commits]

aleksandar-amd wrote:

I’ve created a new [PR]( https://github.com/llvm/llvm-project/pull/192246), as this patch implements a different approach, similar to how SC handles this.

https://github.com/llvm/llvm-project/pull/155824