[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 732d5abb94c7d4e64b36f0a008887534d65a4c22..a2923f43c4db8dd2cf04599d00047d14b9416d37 100644
--- a/src/js/async-await.js
+++ b/src/js/async-await.js
@@ -13,15 +13,10 @@
 
 var AsyncFunctionNext;
 var AsyncFunctionThrow;
-var PromiseCreate;
-var PromiseNextMicrotaskID;
-var RejectPromise;
 
 utils.Import(function(from) {
   AsyncFunctionNext = from.AsyncFunctionNext;
   AsyncFunctionThrow = from.AsyncFunctionThrow;
-  PromiseCreate = from.PromiseCreate;
-  RejectPromise = from.RejectPromise;
 });
 
 var promiseAsyncStackIDSymbol =
@@ -38,7 +33,7 @@ function PromiseCastResolved(value) {
   if (%is_promise(value)) {
     return value;
   } else {
-    var promise = PromiseCreate(UNDEFINED);
+    var promise = %promise_internal_constructor(UNDEFINED);
     %promise_resolve(promise, value);
     return promise;
   }
@@ -77,7 +72,7 @@ function AsyncFunctionAwait(generator, awaited, outerPromise) {
     return;
   }
 
-  var throwawayPromise = PromiseCreate(promise);
+  var throwawayPromise = %promise_internal_constructor(promise);
 
   // The Promise will be thrown away and not handled, but it shouldn't trigger
   // unhandled reject events as its work is done
@@ -115,11 +110,11 @@ 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