Fix async futex wait in WASM worker dose not keep runtime alive

Fix asynchronous futex wait `emscripten_atomic_wait_async`
in WASM worker dose not keep runtime alive.

Author: medns

src/library_wasm_worker.js

@@ -300,10 +300,12 @@ Atomics.waitAsync = (i32a, index, value, maxWaitMilliseconds) => {
     // application does huge amounts of waitAsyncs per second (not sure if
     // possible?)
     // Valid counterrange: 0...2^31-1
+    {{{ runtimeKeepalivePush() }}}
     let counter = liveAtomicWaitAsyncCounter;
     liveAtomicWaitAsyncCounter = Math.max(0, (liveAtomicWaitAsyncCounter+1)|0);
     liveAtomicWaitAsyncs[counter] = addr;
     wait.value.then((value) => {
+      {{{ runtimeKeepalivePop() }}}
       if (liveAtomicWaitAsyncs[counter]) {
         delete liveAtomicWaitAsyncs[counter];
         {{{ makeDynCall('vpiip', 'asyncWaitFinished') }}}(addr, val, atomicWaitStates.indexOf(value), userData);