Don't call dinvoke on Object methods

lib/runtime/dart/core.js

Index: lib/runtime/dart/core.js
diff --git a/lib/runtime/dart/core.js b/lib/runtime/dart/core.js
index 71fc6cdc7428e36b853f7e61907f48282003c2aa..9a6ddab43ee1abc9672b515a0c48c159fedd8307 100644
--- a/lib/runtime/dart/core.js
+++ b/lib/runtime/dart/core.js
@@ -2727,7 +2727,7 @@ var core;
     get hashCode() {
       // Function combine: (dynamic, dynamic) → int
       function combine(part, current) {
-        return dart.as(dart.dbinary(dart.dbinary(dart.dbinary(current, '*', 31), '+', dart.dload(part, 'hashCode')), '&', 1073741823), int);
+        return dart.as(dart.dbinary(dart.dbinary(dart.dbinary(current, '*', 31), '+', part.hashCode), '&', 1073741823), int);
       }
       return combine(this.scheme, combine(this.userInfo, combine(this.host, combine(this.port, combine(this.path, combine(this.query, combine(this.fragment, 1)))))));
     }