Remove last references to frog from SDK.

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 2262 matching lines @@
         isNot = true;
       }
 
       DartType type = elements.getType(typeAnnotation);
       HInstruction typeInfo = null;
       if (compiler.codegenWorld.rti.hasTypeArguments(type)) {
         pushInvokeHelper1(interceptors.getGetRuntimeTypeInfo(), expression);
         typeInfo = pop();
       }
       if (type.element.isTypeVariable()) {
-        // TODO(karlklose): We emulate the behavior of the old frog
-        // compiler and answer true to any is check involving a type variable
-        // -- both is T and is !T -- until we have a proper implementation of
-        // reified generics.
+        // TODO(karlklose): We currently answer true to any is check 
+        // involving a type variable -- both is T and is !T -- until 
+        // we have a proper implementation of reified generics.
         stack.add(graph.addConstantBool(true, constantSystem));
       } else {
         HInstruction instruction;
         if (typeInfo !== null) {
           instruction = new HIs.withTypeInfoCall(type, expression, typeInfo);
         } else {
           instruction = new HIs(type, expression);
         }
         if (isNot) {
           add(instruction);
@@ skipping 2030 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }