Block-scoped functions in evals are now only conditionally hoisted out.

test/mjsunit/es6/block-eval-var-over-let.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Var-let conflict in a function throws, even if the var is in an eval
 
 // Throws at the top level of a function
 assertThrows(function() {
   let x = 1;
   eval('var x');
@@ skipping 106 matching lines @@
     {
       let x = 1;
       eval('function x() {}');
     }
   })();
 } catch (e) {
   caught = true;
 }
 assertTrue(caught);
 
-// TODO(littledan): Hoisting x out of the block should be
-// prevented in this case BUG(v8:4479)
 caught = false
 try {
   (function() {
     {
       let x = 1;
       eval('{ function x() {} }');
     }
   })();
 } catch (e) {
   caught = true;
 }
-// TODO(littledan): switch to assertTrue when bug is fixed
-assertTrue(caught);
+assertFalse(caught);