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async function foo() {
// Suspend this function until later.
await undefined;
// Capture the stack using JS::AllFrames.
saveStack();
// Capture the stack using JS::FirstSubsumedFrame.
var g = newGlobal({principal: {}});
captureFirstSubsumedFrame(g);
}
// Invoke foo. This will capture the stack and mark the bit
// on the top-level script, but we clear it below.
foo();
// Tier up to blinterp, clearing the hasCachedSavedFrame bit
// on the top-level script.
for (var i = 0; i < 20; i++) {}
// Continue execution of foo.
drainJobQueue();