Faster async functions and promises

https://v8.dev/blog/fast-async

async function computeAnswer() {
return 42;
}
undefined
const p = computeAnswer();

undefined
p.then(console.log);

42
Promise {<resolved>: undefined}

async function foo() {
const v = await 42;
return v;
}
undefined
const p = foo();

undefined
p.then(console.log);

42
Promise {<resolved>: undefined}