stream: simplify `setPromiseHandled` utility · nodejs/node@ff86b1d

// MarkAsHandled, but this avoids the extra boundary cross

// and is hopefully faster at the cost of an extra Promise

// allocation.

PromisePrototypeThen(promise, () => {}, () => {});

PromisePrototypeThen(promise, undefined, () => {});

}

async function nonOpFlush() {}