Specialize Symbol.hashCode

runtime/lib/symbol_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class Symbol {
   /* patch */ const Symbol(String name)
       : this._name = name;
 
   /* patch */ toString() => 'Symbol("${getUnmangledName(this)}")';
 
@@ skipping 33 matching lines @@
       }
       if (!skip) {
         result.write(char);
       }
     }
     if (add_setter_suffix) {
       result.write('=');
     }
     return result.toString();
   }
+
+  /* patch */ int get hashCode {
+    const arbitraryPrime = 664597;
+    return 0x1fffffff & (arbitraryPrime * _name.hashCode);
+  }
 }