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

[Jay Foad via llvm-commits]

jayfoad wrote:

SkipUniformRegions was previously disabled for AMDGPU in https://reviews.llvm.org/D77228 "since it causes several functional issues in HIP applications".

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