[llvm] [AMDGPU] Do not preserve UniformityInfo (PR #76696)

[Jay Foad via llvm-commits]

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@@ -33,6 +33,12 @@
 /// the propagation of the impact of divergent control flow on the divergence of
 /// values (sync dependencies).
 ///
+/// NOTE: In general, no interface exists for a transform to update
+/// (Machine)UniformityInfo. Additionally, (Machine)CycleAnalysis is a
+/// transitive dependence, but it also does not provide an interface for
+/// updation. Given that, transforms should not preserve uniformity in their
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jayfoad wrote:

"updation" should be a word! :-)

https://github.com/llvm/llvm-project/pull/76696