[promises] move most of FulfillPromise to c++

src/js/promise.js

Index: src/js/promise.js
diff --git a/src/js/promise.js b/src/js/promise.js
index 2594195c43bf4a85de8adf5242e9606d7630586f..7e0ad4906f798f2b8d36fd3a410e8c8db0637c9e 100644
--- a/src/js/promise.js
+++ b/src/js/promise.js
@@ -143,11 +143,7 @@ function PromiseInit(promise) {
 }
 
 function FulfillPromise(promise, status, value, promiseQueue) {
-  var tasks = GET_PRIVATE(promise, promiseQueue);
-  if (!IS_UNDEFINED(tasks)) {
-    var deferred = GET_PRIVATE(promise, promiseDeferredReactionSymbol);
-    %EnqueuePromiseReactionJob(value, tasks, deferred, status);
-  }
+  %PromiseFulfill(promise, status, value, promiseQueue);
   PromiseSet(promise, status, value);
 }