next.js

1c86b8a4 - turbo-tasks: add scope_unbounded, a scoped execution primitive that allows more work to be discovered (#95974)

turbo-tasks: add scope_unbounded, a scoped execution primitive that allows more work to be discovered (#95974) ## What Adds `scope_unbounded `, a parallel scope to turbo-tasks: jobs run on a shared work-queue, any job may enqueue more, and the pool is drained by the runtime worker threads plus the calling thread until empty. ## Why The garbage collector (later in this stack) needs to process a pool of work that *discovers more work as it runs* — collecting a task cascades into collecting newly-parentless children. A fixed `parallel::for_each` can't express that. `scope_self_feeding` is the general primitive for "parallel pool where jobs spawn jobs". ## Design notes - **Deadlock-safe on thread-limited / contended runtimes.** Helper workers are a pure optimization: the calling thread always makes progress on the shared queue on its own, so the pool completes even when no worker threads are available. - Supports growing/shrinking the set of workers pulling from the queue based on the amount of work available. - Supports a simple mostly lock free way to aggregate data from the tasks - Supports a way for tasks to abort the whole queue, which is important for making GC interruptible ## Testing There are a fair number of new unit tests and i have done some runs under miri