[promises] Move promise constructor to TFS

src/runtime/runtime-promise.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/debug/debug.h"
 #include "src/elements.h"
 #include "src/promise-utils.h"
 
@@ skipping 171 matching lines @@
   return isolate->heap()->undefined_value();
 }
 
 RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   isolate->RunMicrotasks();
   return isolate->heap()->undefined_value();
 }
 
+RUNTIME_FUNCTION(Runtime_CreateResolvingFunctions) {
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
+  Handle<JSFunction> resolve, reject;
+
+  PromiseUtils::CreateResolvingFunctions(
+      isolate, promise, isolate->factory()->true_value(), &resolve, &reject);
+
+  Handle<FixedArray> result = isolate->factory()->NewFixedArray(2);
+  result->set(0, *resolve);
+  result->set(1, *reject);
+
+  return *result;
+}
+
 }  // namespace internal
 }  // namespace v8