[llvm-branch-commits] [llvm] [AMDGPU] Prevent SI_CS_CHAIN instruction from giving registers classes in generic instructions (PR #131329)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

> SI_CS_CHAIN adds register classes to generic instruction. This causes 
> legalize combiner to break.

Break how? This should still work

https://github.com/llvm/llvm-project/pull/131329
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