internal/task: swap stack chain when switching goroutines

This change swaps the stack chain when switching goroutines, ensuring that the chain is maintained consistently.
This is only really currently necessary with asyncify on wasm.

src/internal/task/task_stack.go

@@ -1,3 +1,4 @@
+//go:build scheduler.tasks
 // +build scheduler.tasks
 
 package task
@@ -54,7 +55,9 @@ func pause() {
 // This may only be called from the scheduler.
 func (t *Task) Resume() {
 	currentTask = t
+	t.gcData.swap()
 	t.state.resume()
+	t.gcData.swap()
 	currentTask = nil
 }