Introduce typed selectors for getters and setters also for better tree shaking.

lib/compiler/implementation/ssa/builder.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 Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 2097 matching lines @@
       HInstruction self = localsHandler.readThis();
       Identifier identifier = node.selector.asIdentifier();
       String name = identifier.source.slowToString();
       // TODO(ahe): Add the arguments to this list.
       push(new HLiteralList([]));
       var inputs = <HInstruction>[
           target,
           self,
           graph.addConstantString(new DartString.literal(name)),
           pop()];
-      push(new HInvokeSuper(const Selector(SelectorKind.INVOCATION, 2),
-                            inputs));
+      push(new HInvokeSuper(Selector.INVOCATION_2, inputs));
       return;
     }
     HInstruction target = new HStatic(element);
     HInstruction context = localsHandler.readThis();
     add(target);
     var inputs = <HInstruction>[target, context];
     if (element.kind == ElementKind.FUNCTION ||
         element.kind == ElementKind.GENERATIVE_CONSTRUCTOR) {
       bool succeeded = addStaticSendArgumentsToList(selector, node.arguments,
                                                     element, inputs);
@@ skipping 993 matching lines @@
                                         false,
                                         <HInstruction>[target, input]));
     return builder.pop();
   }
 
   HInstruction result() {
     flushLiterals();
     return prefix;
   }
 }