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09f35473e4
Bind the `task` class to `VTask` with a native `Await` method. For tasks created before this binding, `VTask` uses a trivial emergent type and shape, so code that runs in this context (i.e. module top-levels) does not support structured concurrency. Each `sync` arm spawns a new task, and the overall expression `Await`s each of them in turn to collect their results. These tasks may need to remain active when the outer `sync` expression suspends, which conflicts with the way lenient suspension forcibly suspends child tasks - to resolve this, suspenion no longer affects child tasks (in fact child tasks are no longer tracked at all) and instead `EndTask` (really any time the current task changes) must check for an already-suspended `YieldTask`. Also adjust the bytecode of `for` loops so that the body runs outside of any failure context, rather than forwarding failures. This enables `<suspends>` calls in `for` loop bodies. #rb Markus.Breyer [CL 32277546 by russell johnston in ue5-main branch]