Revert "dart2js cps: Compile some loops as 'for' loops."

pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart

 // Copyright (c) 2014, 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.
 
 library tree_ir.optimization.logical_rewriter;
 
 import '../tree_ir_nodes.dart';
 import 'optimization.dart' show Pass;
 import '../../constants/values.dart' as values;
 
@@ skipping 172 matching lines @@
     return node;
   }
 
   Statement visitWhileTrue(WhileTrue node) {
     fallthrough.push(node);
     node.body = visitStatement(node.body);
     fallthrough.pop();
     return node;
   }
 
-  Statement visitFor(For node) {
+  Statement visitWhileCondition(WhileCondition node) {
     fallthrough.push(node);
     node.condition = makeCondition(node.condition, true, liftNots: false);
     node.body = visitStatement(node.body);
     fallthrough.pop();
     node.next = visitStatement(node.next);
     return node;
   }
 
   Statement visitBreak(Break node) {
     if (isFallthroughBreak(node)) {
@@ skipping 333 matching lines @@
   bool isSameVariable(Expression e1, Expression e2) {
     if (e1 is VariableUse) {
       return e2 is VariableUse && e1.variable == e2.variable;
     } else if (e1 is Assign) {
       return e2 is VariableUse && e1.variable == e2.variable;
     }
     return false;
   }
 }