First stab at mixins in VM compiler

runtime/vm/symbols.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 
@@ skipping 264 matching lines @@
   }
   static const String& DoubleQuotes() {
     return *(symbol_handles_[kNullCharId + '"']);
   }
   static const String& LowercaseR() {
     return *(symbol_handles_[kNullCharId + 'r']);
   }
   static const String& Dash() {
     return *(symbol_handles_[kNullCharId + '-']);
   }
+  static const String& Ampersand() {
+    return *(symbol_handles_[kNullCharId + '&']);
+  }
 
   // Access methods for symbol handles stored in the vm isolate.
 #define DEFINE_SYMBOL_HANDLE_ACCESSOR(symbol, literal)                         \
   static const String& symbol() { return *(symbol_handles_[k##symbol##Id]); }
 PREDEFINED_SYMBOLS_LIST(DEFINE_SYMBOL_HANDLE_ACCESSOR)
 #undef DEFINE_SYMBOL_HANDLE_ACCESSOR
 
   // Initialize frequently used symbols in the vm isolate.
   static void InitOnce(Isolate* isolate);
 
@@ skipping 95 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_