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

lib/compiler/implementation/ssa/nodes.dart

Index: lib/compiler/implementation/ssa/nodes.dart
===================================================================
--- lib/compiler/implementation/ssa/nodes.dart	(revision 7416)
+++ lib/compiler/implementation/ssa/nodes.dart	(working copy)
@@ -1209,20 +1209,28 @@
 }
 
 class HFieldGet extends HInstruction {
-  final Element element;
-  HFieldGet(Element this.element, HInstruction receiver)
+  final SourceString name;
+  HFieldGet(SourceString this.name, HInstruction receiver)
       : super(<HInstruction>[receiver]);
-  HFieldGet.fromActivation(Element this.element) : super(<HInstruction>[]);
+  HFieldGet.fromActivation(SourceString this.name) : super(<HInstruction>[]);
 
   HInstruction get receiver() => inputs.length == 1 ? inputs[0] : null;
   accept(HVisitor visitor) => visitor.visitFieldGet(this);
+
+  void prepareGvn() {
+    clearAllSideEffects();
+  }
+
+  int typeCode() => 27;
+  bool typeEquals(other) => other is HFieldGet;
+  bool dataEquals(HFieldGet other) => name == other.name;
 }
 
 class HFieldSet extends HInstruction {
-  final Element element;
-  HFieldSet(Element this.element, HInstruction receiver, HInstruction value)
+  final SourceString name;
+  HFieldSet(SourceString this.name, HInstruction receiver, HInstruction value)
       : super(<HInstruction>[receiver, value]);
-  HFieldSet.fromActivation(Element this.element, HInstruction value)
+  HFieldSet.fromActivation(SourceString this.name, HInstruction value)

[kasperl, 2012/05/09 08:04:23]

I think the spec has been updated to "infer" the type of this.x style
constructor parameters from the field definition. It is fine for to keep the
type here for consistency, but I think we should be moving away from them.

[ngeoffray, 2012/05/09 10:07:58]

OK, I removed the type on these constructors.

       : super(<HInstruction>[value]);
 
   HInstruction get receiver() => inputs.length == 2 ? inputs[0] : null;