[llvm] [AMDGPU] Enable StructurizeCFG SkipUniformRegions (PR #206739)

[Jay Foad via llvm-commits]

jayfoad wrote:

Moved to draft since this does indeed cause some test failures e.g. in https://github.com/ROCm/rocm-libraries/tree/develop/projects/rocprim.

https://github.com/llvm/llvm-project/pull/206739