Import tests from Google V8 (Block Scope Additions)

These tests are derived from the following files within the Google V8 project:

    test/mjsunit/es6/regress/regress-2506.js
    test/mjsunit/es6/regress/regress-3426.js
    test/mjsunit/es6/regress/regress-3683.js

test/language/block-scope/syntax/for-in/mixed-values-in-iteration.js

@@ -5,7 +5,6 @@ es6id: 13.1
 description: >
     Mixed values in iteration
 ---*/
-"use strict";
 function fn(x) {
   let a = [];
   for (let p in x) {

test/language/statements/const/redeclaration-error-from-within-strict-mode-function-const.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.1
+description: >
+    Redeclaration error within strict mode function inside non-strict code.
+negative: SyntaxError
+flags: [noStrict]
+---*/
+(function() { 'use strict'; { const f = 1; var f; } })
+

test/language/block-scope/syntax/for-loop/const-invalid-assignment-next-expression.js → test/language/statements/const/syntax/const-invalid-assignment-next-expression-for.js

 // Copyright (C) 2015 Rick Waldron. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-es6id: 13.1
+es6id: 13.6.3.7_S5.a.i
 description: >
     const: invalid assignment in next expression
 negative: TypeError
 ---*/
 
-for (const i = 0; i < 1; i++) { }
+for (const i = 0; i < 1; i++) {}

test/language/statements/const/syntax/const-invalid-assignment-statement-body-for-in.js

+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.6.4.10_S1.a.i
+description: >
+    const: invalid assignment in Statement body
+negative: TypeError
+---*/
+
+for (const x in [1, 2, 3]) { x++ }

test/language/statements/const/syntax/const-invalid-assignment-statement-body-for-of.js

+// Copyright (C) 2011 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 13.6.4.10_S1.a.i
+description: >
+    const: invalid assignment in Statement body
+negative: TypeError
+---*/
+
+for (const x of [1, 2, 3]) { x++ }