Start creating a MemberSet abstraction, and use it to fold getters/setters into field accesses.

lib/compiler/implementation/ssa/codegen.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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   SsaCodeGeneratorTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA code generator';
 
 
   String buildJavaScriptFunction(FunctionElement element,
@@ skipping 1460 matching lines @@
           compiler.namer.getterName(currentLibrary, superMethod.name);
       buffer.add('$className.prototype.$methodName.call()');
     }
     endExpression(JSPrecedence.CALL_PRECEDENCE);
     compiler.registerStaticUse(superMethod);
   }
 
   visitFieldGet(HFieldGet node) {
     if (node.receiver !== null) {
       String name =
-          compiler.namer.instanceFieldName(currentLibrary, node.element.name);
+          compiler.namer.instanceFieldName(currentLibrary, node.name);
       beginExpression(JSPrecedence.MEMBER_PRECEDENCE);
       use(node.receiver, JSPrecedence.MEMBER_PRECEDENCE);
       buffer.add('.');
       buffer.add(name);
       beginExpression(JSPrecedence.MEMBER_PRECEDENCE);
     } else {
-      buffer.add(JsNames.getValid(node.element.name.slowToString()));
+      buffer.add(JsNames.getValid(node.name.slowToString()));
     }
   }
 
   visitFieldSet(HFieldSet node) {
     String name;
     if (node.receiver !== null) {
       name =
-          compiler.namer.instanceFieldName(currentLibrary, node.element.name);
+          compiler.namer.instanceFieldName(currentLibrary, node.name);
       beginExpression(JSPrecedence.ASSIGNMENT_PRECEDENCE);
       use(node.receiver, JSPrecedence.MEMBER_PRECEDENCE);
       buffer.add('.');
       buffer.add(name);
     } else {
       // TODO(ngeoffray): Remove the 'var' once we don't globally box
       // variables used in a try/catch.
-      name = JsNames.getValid(node.element.name.slowToString());
+      name = JsNames.getValid(node.name.slowToString());
       declareVariable(name);
     }
     buffer.add(' = ');
     use(node.value, JSPrecedence.ASSIGNMENT_PRECEDENCE);
     if (node.receiver !== null) {
       endExpression(JSPrecedence.ASSIGNMENT_PRECEDENCE);
     }
   }
 
   visitForeign(HForeign node) {
@@ skipping 1006 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endLabeledBlock(HLabeledBlockInformation labeledBlockInfo) {
     if (labeledBlockInfo.body.start.hasGuards()) {
       endBailoutSwitch();
     }
   }
 }