Fix debug-promises tests.

test/mjsunit/es6/debug-promises/throw-with-undefined-reject.js

Index: test/mjsunit/es6/debug-promises/throw-with-undefined-reject.js
diff --git a/test/mjsunit/es6/debug-promises/throw-with-undefined-reject.js b/test/mjsunit/es6/debug-promises/throw-with-undefined-reject.js
index 0162fe1006e55db7755abaffb9109927f4768505..94dcdffa225e11a5255801e8d9eccfdd972e50f7 100644
--- a/test/mjsunit/es6/debug-promises/throw-with-undefined-reject.js
+++ b/test/mjsunit/es6/debug-promises/throw-with-undefined-reject.js
@@ -53,7 +53,7 @@ function listener(event, exec_state, event_data, data) {
       } else {
         assertUnreachable();
       }
-      assertEquals(q, event_data.promise());
+      assertSame(q, event_data.promise());
     }
   } catch (e) {
     %AbortJS(e + "\n" + e.stack);