[llvm] [AMDGPU] Fold constant offsets into named barrier addresses (PR #205216)

[Jay Foad via llvm-commits]

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jayfoad wrote:

Should really add a common prefix for the DAG and GISEL checks, like prefixes=GFX1250,SDAG and prefixes=GFX1250,GISEL.

https://github.com/llvm/llvm-project/pull/205216