Add tests for restricted grammar productions

test/language/global-code/return.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-scripts
+es6id: 15.1
+description: ReturnStatement may not be used directly within global code
+info: |
+  Syntax
+
+  Script :
+    ScriptBodyopt
+
+  ScriptBody :
+    StatementList[~Yield, ~Return]
+negative: SyntaxError
+---*/
+
+return;

test/language/global-code/yield-non-strict.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-scripts
+es6id: 15.1
+description: >
+  The `yield` token is interpreted as an Identifier when it appears in global
+  code (non-strict mode)
+info: |
+  Syntax
+
+  Script :
+    ScriptBodyopt
+
+  ScriptBody :
+    StatementList[~Yield, ~Return]
+flags: [noStrict]
+---*/
+
+// Avoid test failures in cases where the host has defined a `yield` property
+// on the global object.
+try {
+  yield = 0;
+} catch (_) {}

test/language/global-code/yield-strict.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-scripts
+es6id: 15.1
+description: >
+  The `yield` token is interpreted as an Identifier when it appears in global
+  code (strict mode)
+info: |
+  Syntax
+
+  Script :
+    ScriptBodyopt
+
+  ScriptBody :
+    StatementList[~Yield, ~Return]
+flags: [onlyStrict]
+negative: SyntaxError
+---*/
+
+yield;

test/language/module-code/parse-err-return.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-modules
+es6id: 15.2
+description: ReturnStatement may not be used directly within ModuleBody
+info: |
+  Syntax
+
+  Module :
+    ModuleBodyopt
+
+  ModuleBody :
+    ModuleItemList
+
+  ModuleItemList :
+    ModuleItem
+    ModuleItemList ModuleItem
+
+  ModuleItem:
+    ImportDeclaration
+    ExportDeclaration
+    StatementListItem[~Yield, ~Return]
+flags: [module]
+negative: SyntaxError
+---*/
+
+return;

test/language/module-code/parse-err-yield.js

+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-modules
+es6id: 15.2
+description: YieldExpression may not be used directly within ModuleBody
+info: |
+  Syntax
+
+  Module :
+    ModuleBodyopt
+
+  ModuleBody :
+    ModuleItemList
+
+  ModuleItemList :
+    ModuleItem
+    ModuleItemList ModuleItem
+
+  ModuleItem:
+    ImportDeclaration
+    ExportDeclaration
+    StatementListItem[~Yield, ~Return]
+flags: [module]
+negative: SyntaxError
+---*/
+
+yield;