[promise] make Promise.resolve match spec

test/mjsunit/es6/promises.js

Index: test/mjsunit/es6/promises.js
diff --git a/test/mjsunit/es6/promises.js b/test/mjsunit/es6/promises.js
index 10e47c43d5c320cf44322344f5c5ed29407513a1..e4c8b389e817c715ddf292b65609eefc5b5388f2 100644
--- a/test/mjsunit/es6/promises.js
+++ b/test/mjsunit/es6/promises.js
@@ -47,6 +47,8 @@ function clear(o) {
   clear(o.__proto__)
   var properties = getOwnPropertyNames(o)
   for (var i in properties) {
+    // Do not clobber Object.prototype.toString, which is used by tests.
+    if (properties[i] === "toString") continue;
     clearProp(o, properties[i])
   }
 }
@@ -1050,7 +1052,8 @@ function assertAsyncDone(iteration) {
 
   log = ""
   MyPromise.all([21, Promise.accept(22), 23, MyPromise.accept(24), 25, 26])
-  assertTrue(log === "nx24nnx21nnnnx23nnnx25nnx26n", "subclass/all/self")
+  assertTrue(log === "nx24nnx21nnx[object Promise]nnx23nnnx25nnx26n",
+             "subclass/all/self")
 })();
 
 (function() {