[AMDGPU][gfx12] Clean-up implementation of waits before SCOPE_SYS stores (#150587) We can do it all in finalizeStore if we ensure it always sees the stores. For that, I needed to fix a hidden bug where finalizeStore wouldn't see all stores because sometimes the iterator got out-of-sync and didn't point to the store anymore. This also removes the waits before volatile LDS stores which never needed it, that was a bug until now.
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