[es6] Make sure we do not invoke setter when calling Promise.all

src/promise.js

Index: src/promise.js
diff --git a/src/promise.js b/src/promise.js
index 2634fde0bb8e8c9b5f0e5eb52be5dd7fde566125..0fd4b89c5173821f972a37d18f78ab789fe1159f 100644
--- a/src/promise.js
+++ b/src/promise.js
@@ -189,11 +189,11 @@ function PromiseDeferred() {
       reject: function(r) { PromiseReject(promise, r) }
     };
   } else {
-    var result = {};
+    var result = {promise: UNDEFINED, reject: UNDEFINED, resolve: UNDEFINED};
     result.promise = new this(function(resolve, reject) {
       result.resolve = resolve;
       result.reject = reject;
-    })
+    });
     return result;
   }
 }