[es6] Fix for-const loops

test/mjsunit/harmony/block-const-assign.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 75 matching lines @@
   return "(function constvar() { " + use + "; })();";
 }
 
 
 // Function expression name, assign from eval.
 function constDecl9(use) {
   use = "eval('(function(){" + use + "})')()";
   return "(function constvar() { " + use + "; })();";
 }
 
+// For loop variable.
+function constDecl10(use) {
+  return "(function() { for (const constvar = 0; ;) { " + use + "; } })();";
+}
+
+// For-in loop variable.
+function constDecl11(use) {
+  return "(function() { for (const constvar in {a: 1}) { " + use + "; } })();";
+}
+
+// For-of loop variable.
+function constDecl12(use) {
+  return "(function() { for (const constvar of [1]) { " + use + "; } })();";
+}
+
+
 let decls = [ constDecl0,
               constDecl1,
               constDecl2,
               constDecl3,
               constDecl4,
               constDecl5,
               constDecl6,
               constDecl7,
               constDecl8,
-              constDecl9
+              constDecl9,
+              constDecl10,
+              constDecl11,
+              constDecl12
               ];
 let declsForTDZ = new Set([constDecl1, constDecl3, constDecl5, constDecl7]);
 let uses = [ 'constvar = 1;',
              'constvar += 1;',
              '++constvar;',
              'constvar++;'
              ];
 
 function Test(d,u) {
   'use strict';
@@ skipping 12 matching lines @@
     return;
   }
   assertUnreachable();
 }
 
 for (var d = 0; d < decls.length; ++d) {
   for (var u = 0; u < uses.length; ++u) {
     Test(decls[d], uses[u]);
   }
 }