[wgpu-sync]: Centralize usage of once_cell - #10091
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Centralizes configuration of `once_cell` and avoids duplicating fallback logic across crates.
Replaces both `std::sync` and `once_cell` usage.
The project is otherwise not `no_alloc` compatible, and is capable of making a breaking change in the future if desirable. Co-Authored-By: Kevin Reid <kpreid@switchb.org>
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Description
While working on #9780, I noticed
once_cellandstd::syncare inconsistently used acrosswgpu-halandwgpu-core. Similar to that PR, I'm proposing we centralize usage ofLazy,OnceCell, etc. towgpu-sync, to makeno_stdconfiguration simpler and reduce maintenance burden.Testing
cargo check, as there are no changes in the public API or behaviour (beyond exportingonce_cellin the psuedo-publicwgpu-syncAPI).Squash or Rebase?
Rebase.
Checklist
wgpumay be affected behaviorally.CHANGELOG.mdentries for the user-facing effects of this change are present.