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

lib/compiler/implementation/universe.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 Universe {
   Map<Element, String> generatedCode;
   Map<Element, String> generatedBailoutCode;
   final Set<ClassElement> instantiatedClasses;
   final Set<SourceString> instantiatedClassInstanceFields;
   final Set<FunctionElement> staticFunctionsNeedingGetter;
@@ skipping 41 matching lines @@
   }
 
   bool hasGetter(Element member, Compiler compiler) {
     return hasMatchingSelector(
         compiler.universe.invokedGetters[member.name], member, compiler);
   }
 
   bool hasSetter(Element member, Compiler compiler) {
     return hasMatchingSelector(
         compiler.universe.invokedSetters[member.name], member, compiler);
-  }  
+  }
 }
 
 class SelectorKind {
   final String name;
   const SelectorKind(this.name);
 
   static final SelectorKind GETTER = const SelectorKind('getter');
   static final SelectorKind SETTER = const SelectorKind('setter');
   static final SelectorKind INVOCATION = const SelectorKind('invocation');
   static final SelectorKind OPERATOR = const SelectorKind('operator');
@@ skipping 265 matching lines @@
 
     return false;
   }
 
   bool operator ==(other) {
     if (other is !TypedSelector) return false;
     if (other.receiverType !== receiverType) return false;
     return super == other;
   }
 }