Do not trigger ExceptionEvents for another forwarding case

src/js/promise.js

Index: src/js/promise.js
diff --git a/src/js/promise.js b/src/js/promise.js
index 9e4179ae30d7013bbbc16a58cca7acb2dc0c2584..c86cee5d4a0a4edaf078ff07802c90debf65f124 100644
--- a/src/js/promise.js
+++ b/src/js/promise.js
@@ -216,8 +216,8 @@ function PromiseAttachCallbacks(promise, deferred, onResolve, onReject) {
   }
 }
 
-function PromiseIdResolveHandler(x) { return x }
-function PromiseIdRejectHandler(r) { throw r }
+function PromiseIdResolveHandler(x) { return x; }
+function PromiseIdRejectHandler(r) { %_ReThrow(r); }
 
 function PromiseNopResolver() {}