Don't call dinvoke on Object methods

lib/runtime/dart/collection.js

 var collection;
 (function(exports) {
   'use strict';
   let _source = Symbol('_source');
   let UnmodifiableListView$ = dart.generic(function(E) {
     class UnmodifiableListView extends _internal.UnmodifiableListBase$(E) {
       UnmodifiableListView(source) {
         this[_source] = source;
         super.UnmodifiableListBase();
       }
       get [core.$length]() {
         return this[_source][core.$length];
       }
       [core.$get](index) {
         return this[_source][core.$elementAt](index);
       }
     }
     return UnmodifiableListView;
   });
   dart.defineLazyClassGeneric(exports, 'UnmodifiableListView', {get: UnmodifiableListView$});
   // Function _defaultEquals: (dynamic, dynamic) → bool
   function _defaultEquals(a, b) {
     return dart.equals(a, b);
   }
   // Function _defaultHashCode: (dynamic) → int
   function _defaultHashCode(a) {
-    return dart.as(dart.dload(a, 'hashCode'), core.int);
+    return a.hashCode;
   }
   let _Equality$ = dart.generic(function(K) {
     class _Equality extends core.Function {}
     return _Equality;
   });
   let _Equality = _Equality$();
   let _Hasher$ = dart.generic(function(K) {
     class _Hasher extends core.Function {}
     return _Hasher;
   });
@@ skipping 3524 matching lines @@
           return null;
         }
       }
       static [_isStringKey](key) {
         return dart.notNull(typeof key == 'string') && dart.notNull(!dart.equals(key, '__proto__'));
       }
       static [_isNumericKey](key) {
         return dart.notNull(dart.is(key, core.num)) && (key & 0x3ffffff) === key;
       }
       [_computeHashCode](key) {
-        return dart.dload(key, 'hashCode') & 0x3ffffff;
+        return key.hashCode & 0x3ffffff;
       }
       static [_hasTableEntry](table, key) {
         let entry = table[key];
         return entry != null;
       }
       static [_getTableEntry](table, key) {
         let entry = table[key];
         return entry === table ? null : entry;
       }
       static [_setTableEntry](table, key, value) {
@@ skipping 387 matching lines @@
         this[_length] = dart.notNull(this[_length]) - 1;
         this[_modified]();
       }
       static [_isStringKey](key) {
         return dart.notNull(typeof key == 'string') && dart.notNull(!dart.equals(key, '__proto__'));
       }
       static [_isNumericKey](key) {
         return dart.notNull(dart.is(key, core.num)) && (key & 0x3ffffff) === key;
       }
       [_computeHashCode](key) {
-        return dart.dload(key, 'hashCode') & 0x3ffffff;
+        return key.hashCode & 0x3ffffff;
       }
       static [_getTableEntry](table, key) {
         return table[key];
       }
       static [_setTableEntry](table, key, value) {
         dart.assert(value != null);
         table[key] = value;
       }
       static [_deleteTableEntry](table, key) {
         delete table[key];
@@ skipping 355 matching lines @@
           return false;
         }
       }
       static [_isStringElement](element) {
         return dart.notNull(typeof element == 'string') && dart.notNull(!dart.equals(element, '__proto__'));
       }
       static [_isNumericElement](element) {
         return dart.notNull(dart.is(element, core.num)) && (element & 0x3ffffff) === element;
       }
       [_computeHashCode](element) {
-        return dart.dload(element, 'hashCode') & 0x3ffffff;
+        return element.hashCode & 0x3ffffff;
       }
       static [_hasTableEntry](table, key) {
         let entry = table[key];
         return entry != null;
       }
       static [_setTableEntry](table, key, value) {
         dart.assert(value != null);
         table[key] = value;
       }
       static [_deleteTableEntry](table, key) {
@@ skipping 351 matching lines @@
         this[_length] = dart.notNull(this[_length]) - 1;
         this[_modified]();
       }
       static [_isStringElement](element) {
         return dart.notNull(typeof element == 'string') && dart.notNull(!dart.equals(element, '__proto__'));
       }
       static [_isNumericElement](element) {
         return dart.notNull(dart.is(element, core.num)) && (element & 0x3ffffff) === element;
       }
       [_computeHashCode](element) {
-        return dart.dload(element, 'hashCode') & 0x3ffffff;
+        return element.hashCode & 0x3ffffff;
       }
       static [_getTableEntry](table, key) {
         return table[key];
       }
       static [_setTableEntry](table, key, value) {
         dart.assert(value != null);
         table[key] = value;
       }
       static [_deleteTableEntry](table, key) {
         delete table[key];
@@ skipping 204 matching lines @@
   exports.LinkedHashMapKeyIterable$ = LinkedHashMapKeyIterable$;
   exports.LinkedHashMapKeyIterable = LinkedHashMapKeyIterable;
   exports.LinkedHashMapKeyIterator$ = LinkedHashMapKeyIterator$;
   exports.LinkedHashMapKeyIterator = LinkedHashMapKeyIterator;
   exports.HashSetIterator$ = HashSetIterator$;
   exports.HashSetIterator = HashSetIterator;
   exports.LinkedHashSetCell = LinkedHashSetCell;
   exports.LinkedHashSetIterator$ = LinkedHashSetIterator$;
   exports.LinkedHashSetIterator = LinkedHashSetIterator;
 })(collection || (collection = {}));