[turbo-tasks]: Manually devirtualize our internal calling conventions#93910

Draft

lukesandberg wants to merge 12 commits into

devirtualize_by_hand_since_rustc_cannot_do_it

Commits on May 19, 2026

Phase 1a: create empty turbo-tasks-handle crate
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Phase 1b: define TurboTasksHandle dispatch + first method (invalidate)
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Phase 1c: expand dispatch surface to full TurboTasksApi/CallApi method list
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Phase 2a-i: add TurboTasksWeakHandle dispatch alongside TurboTasksHandle
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Phase 2a: flip TURBO_TASKS task-local from Arc<dyn TurboTasksApi> to TurboTasksHandle (WIP)
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Phase 2b: delete turbo-tasks-handle; providers move into -backend/-testing
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Move retry helpers from turbo-tasks-testing to turbopack-bench
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Add Unreachable variant to HandleTag for no-features builds
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Rename Prod/Test variants and prod_handle/test_handle features
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Match test/bench TurboTasks construction to ProdHandleConcrete type
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Fix `&*turbo_tasks::turbo_tasks()` in turbo-tasks-fetch; remove backend self-dev-dep
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Fall back to dynamic dispatch in `make_handle` when static_handle is off
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