Revert of Ship ES2015 sloppy-mode function hoisting, let, class

test/mjsunit/es6/block-eval-var-over-legacy-const.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 --harmony-sloppy-let --harmony-sloppy-function
-
-// 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('const x = 2');
-}, TypeError);
-
-// If the eval is in its own block scope, throws
-assertThrows(function() {
-  let y = 1;
-  { eval('const y = 2'); }
-}, TypeError);
-
-// If the let is in its own block scope, with the eval, throws
-assertThrows(function() {
-  {
-    let x = 1;
-    eval('const x = 2');
-  }
-}, TypeError);
-
-// Legal if the let is no longer visible
-assertDoesNotThrow(function() {
-  {
-    let x = 1;
-  }
-  eval('const x = 2');
-});
-
-// In global scope
-let caught = false;
-try {
-  let z = 1;
-  eval('const z = 2');
-} catch (e) {
-  caught = true;
-}
-assertTrue(caught);
-
-// Let declarations beyond a function boundary don't conflict
-caught = false;
-try {
-  let a = 1;
-  (function() {
-    eval('const a');
-  })();
-} catch (e) {
-  caught = true;
-}
-assertFalse(caught);
-
-// var across with doesn't conflict
-caught = false;
-try {
-  (function() {
-    with ({x: 1}) {
-      eval("const x = 2;");
-    }
-  })();
-} catch (e) {
-  caught = true;
-}
-assertFalse(caught);
-
-// var can still conflict with let across a with
-caught = false;
-try {
-  (function() {
-    let x;
-    with ({x: 1}) {
-      eval("const x = 2;");
-    }
-  })();
-} catch (e) {
-  caught = true;
-}
-assertTrue(caught);