[llvm] [LLVM][AMDGPU] AMDGPUInstCombineIntrinsic for *lane intrinsics (PR #99878)

[Jay Foad via llvm-commits]

jayfoad wrote:

> It's also possible for transforms based on uniformity to become incorrect later after code motion until we have convergence tokens wired up to prevent that

I don't understand this. Surely that would just be a bug in the code motion? Do you have an example?

https://github.com/llvm/llvm-project/pull/99878