[promises] Remove runtime call from fastpath in PromiseReject

src/js/prologue.js

Index: src/js/prologue.js
diff --git a/src/js/prologue.js b/src/js/prologue.js
index e564eb5cf803f7d1662a4bab272f62471ff8f20b..e51ab558b6605e62d87b6be93ed9f34122f30e8b 100644
--- a/src/js/prologue.js
+++ b/src/js/prologue.js
@@ -266,7 +266,7 @@ utils.PostDebug = PostDebug;
 
 // -----------------------------------------------------------------------
 
-%OptimizeObjectForAddingMultipleProperties(extrasUtils, 5);
+%OptimizeObjectForAddingMultipleProperties(extrasUtils, 7);
 
 extrasUtils.logStackTrace = function logStackTrace() {
   %DebugTrace();
@@ -307,6 +307,15 @@ extrasUtils.uncurryThis = function uncurryThis(func) {
   };
 };
 
+// We pass true to trigger the debugger's on exception handler.
+extrasUtils.rejectPromise = function rejectPromise(promise, reason) {
+  %promise_internal_reject(promise, reason, true);
+}
+
+extrasUtils.markPromiseAsHandled = function markPromiseAsHandled(promise) {
+  %PromiseMarkAsHandled(promise);
+};
+
 %ToFastProperties(extrasUtils);
 
 })