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

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

Index: pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
diff --git a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
index 3fa61dd22b4d1e5d8f4f58f26164fa4398048d87..253006dac44cafe1fe685f1dcd5da943e6a7c5ef 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart
@@ -664,9 +664,9 @@ class StatementRewriter extends Transformer implements Pass {
     return node;
   }
 
-  Statement visitWhileCondition(WhileCondition node) {
+  Statement visitFor(For node) {
     // Not introduced yet
-    throw "Unexpected WhileCondition in StatementRewriter";
+    throw "Unexpected For in StatementRewriter";
   }
 
   Statement visitTry(Try node) {