[llvm] AMDGPU: Refactor lowering of s_barrier to split barriers (PR #154648)

[Jay Foad via llvm-commits]

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@@ -10439,21 +10439,6 @@ SDValue SITargetLowering::LowerINTRINSIC_VOID(SDValue Op,
       }
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jayfoad wrote:

Can you also remove the wave_barrier case above?

https://github.com/llvm/llvm-project/pull/154648