Remove runtime flags for sloppy mode block scoping features

test/mjsunit/regress/regress-520029.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.
 
-// Flags: --harmony-sloppy-let --harmony-sloppy
-
 // Test that hoisting a function out of a lexical scope does not
 // lead to a parsing error
 
 // This used to cause a crash in the parser
 function f(one) { class x { } { class x { } function g() { one; x; } g() } } f()
 
 // This used to lead to a ReferenceError
 function g() { var x = 1; { let x = 2; function g() { x; } g(); } }
 assertEquals(undefined, g());
 
 // This used to cause a crash in the parser
 function __f_4(one) {
   var __v_10 = one + 1;
   {
     let __v_10 = one + 3;
     function __f_6() {
  one;
  __v_10;
     }
     __f_6();
   }
 }
 __f_4();