Function dispatch

src/lib/libwasm_worker.js:324–328

(idx, ret)

  emscripten_semaphore_async_acquire__deps: ['$polyfillWaitAsync'],
  emscripten_semaphore_async_acquire: (sem, num, asyncWaitFinished, userData, maxWaitMilliseconds) => {
    let dispatch = (idx, ret) => {
      setTimeout(() => {
        {{{ makeDynCall('viiii', 'asyncWaitFinished') }}}(sem, /*val=*/idx, /*waitResult=*/ret, userData);
      }, 0);
    };
    let tryAcquireSemaphore = () => {
      let val = num;
      do {