Ship ES2015 sloppy-mode function hoisting, let, class

test/mjsunit/es6/block-early-errors.js

 // Copyright 2011 the V8 project authors. All rights reserved.
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 // 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.
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 //       copyright notice, this list of conditions and the following
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 //       with the distribution.
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 //       from this software without specific prior written permission.
 //
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 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+// Flags: --no-harmony-sloppy-let
+
 function CheckException(e) {
   var string = e.toString();
   assertInstanceof(e, SyntaxError);
 }
 
 function Check(str) {
   try {
     eval("(function () { " + str + " })");
     assertUnreachable();
   } catch (e) {
     CheckException(e);
   }
   try {
     eval("(function () { { " + str + " } })");
     assertUnreachable();
   } catch (e) {
     CheckException(e);
   }
 }
 
 // Check for early syntax errors when using let
 // declarations outside of strict mode.
 Check("let x;");
 Check("let x = 1;");
 Check("let x, y;");