[llvm] [AMDGPU] Enable "amdgpu-uniform-intrinsic-combine" pass in pipeline. (PR #128687)

[Christudasan Devadasan via llvm-commits]

cdevadas wrote:

This PR should be stacked with https://github.com/llvm/llvm-project/pull/116953. It is hard to review the changes introduced by this PR. It currently combines both.

https://github.com/llvm/llvm-project/pull/128687