[async-await] Remove call indirection in Create and Reject

src/js/async-await.js

Index: src/js/async-await.js
diff --git a/src/js/async-await.js b/src/js/async-await.js
index 5c9c4b5ceba4931aded31ef3d98ac27502415718..a9b4b67f4312505b4ec0ebe20f6751694907a6ed 100644
--- a/src/js/async-await.js
+++ b/src/js/async-await.js
@@ -14,16 +14,11 @@
 var AsyncFunctionNext;
 var AsyncFunctionThrow;
 var CreateInternalPromiseCapability;
-var PromiseCreate;
-var PromiseNextMicrotaskID;
-var RejectPromise;
 
 utils.Import(function(from) {
   AsyncFunctionNext = from.AsyncFunctionNext;
   AsyncFunctionThrow = from.AsyncFunctionThrow;
   CreateInternalPromiseCapability = from.CreateInternalPromiseCapability;
-  PromiseCreate = from.PromiseCreate;
-  RejectPromise = from.RejectPromise;
 });
 
 var promiseAsyncStackIDSymbol =
@@ -42,7 +37,7 @@ function PromiseCastResolved(value) {
   if (%is_promise(value)) {
     return value;
   } else {
-    var promise = PromiseCreate();
+    var promise = %promise_internal_constructor(UNDEFINED);
     %promise_resolve(promise, value);
     return promise;
   }
@@ -121,11 +116,11 @@ function AsyncFunctionAwaitCaught(generator, awaited, outerPromise) {
 
 // How the parser rejects promises from async/await desugaring
 function RejectPromiseNoDebugEvent(promise, reason) {
-  return RejectPromise(promise, reason, false);
+  return %PromiseReject(promise, reason, false);
 }
 
 function AsyncFunctionPromiseCreate() {
-  var promise = PromiseCreate();
+  var promise = %promise_internal_constructor(UNDEFINED);
   if (DEBUG_IS_ACTIVE) {
     // Push the Promise under construction in an async function on
     // the catch prediction stack to handle exceptions thrown before