Start supporting fixed length and immutable lists.

dart/frog/leg/emitter.dart

 // 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.
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
 class ClosureInvocationElement extends FunctionElement {
   ClosureInvocationElement(SourceString name,
@@ skipping 508 matching lines @@
           handler.writeJsCodeForVariable(buffer, element);
         });
       buffer.add(';\n');
     }
   }
 
   void emitCompileTimeConstants(StringBuffer buffer) {
     CompileTimeConstantHandler handler = compiler.compileTimeConstantHandler;
     List<Constant> constants = handler.getConstantsForEmission();
     String prototype = "${namer.ISOLATE}.prototype";
+    emitMakeConstantList(prototype, buffer);
     for (Constant constant in constants) {
       String name = handler.getNameForConstant(constant);
       buffer.add('$prototype.$name = ');
       handler.writeJsCode(buffer, constant);
       buffer.add(';\n');
     }
   }
 
+  void emitMakeConstantList(String prototype, StringBuffer buffer) {
+    buffer.add(prototype);
+    buffer.add(@'''.makeConstantList = function(list) {
+  list.immutable$list = true;
+  list.fixed$length = true;
+  return list;
+};
+''');
+  }
+
   void emitStaticFinalFieldInitializations(StringBuffer buffer) {
     CompileTimeConstantHandler constants = compiler.compileTimeConstantHandler;
     List<VariableElement> staticFinalFields =
         constants.getStaticFinalFieldsForEmission();
     for (VariableElement element in staticFinalFields) {
       buffer.add('${namer.isolatePropertyAccess(element)} = ');
       compiler.withCurrentElement(element, () {
           constants.writeJsCodeForVariable(buffer, element);
         });
       buffer.add(';\n');
@@ skipping 70 matching lines @@
       emitCompileTimeConstants(buffer);
       emitStaticFinalFieldInitializations(buffer);
       buffer.add('var ${namer.CURRENT_ISOLATE} = new ${namer.ISOLATE}();\n');
       Element main = compiler.mainApp.find(Compiler.MAIN);
       buffer.add('${namer.isolateAccess(main)}();\n');
       compiler.assembledCode = buffer.toString();
     });
     return compiler.assembledCode;
   }
 }