Add test for subtask.cancel async in test/async/trap-if-sync-and-waitable-set.wast - #715
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- Per WebAssembly/component-model#715, trap if `subtask.cancel` is called for a subtask that's in a waitable set regardless of whether it's called sync or async. - Per WebAssembly/component-model#687, trap if a thread tries to promote or resume itself. Also, add a `Debug` impl for `GuestThreadState` for future debugging convenience.
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- Per WebAssembly/component-model#715, trap if `subtask.cancel` is called for a subtask that's in a waitable set regardless of whether it's called sync or async. - Per WebAssembly/component-model#687, trap if a thread tries to promote or resume itself. Also, add a `Debug` impl for `GuestThreadState` for future debugging convenience.
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This tests a new condition added in #705 and should've been in that PR.