[llvm] AMDGPU/GFX12: Fix s_barrier_signal_isfirst for single-wave workgroups (PR #143634)

[Carl Ritson via llvm-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/143634 at github.com>


https://github.com/perlfu commented:

The change seems fine; however, the lit test code gen indicates we are not  handling the other conditions required to read SCC.
Specifically we need to wait on `KMcnt`, and a `S_BARRIER_WAIT`?

https://github.com/llvm/llvm-project/pull/143634