[tests] add tests for "yield" as function name

BUG=v8:3983
LOG=N
R=wingo@igalia.com, littledan@chromium.org

Review URL: https://codereview.chromium.org/1437803004

Cr-Commit-Position: refs/heads/master@{#32682}

test/message/nf-yield-in-generator.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.
+
+function* gen() {
+  function yield() {}
+}

test/message/nf-yield-in-generator.out

+*%(basename)s:6: SyntaxError: Unexpected identifier
+  function yield() {}
+           ^^^^^
+SyntaxError: Unexpected identifier

test/message/nf-yield-strict-in-generator.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.
+
+function* gen() {
+  "use strict";
+  function yield() {}
+}

test/message/nf-yield-strict-in-generator.out

+*%(basename)s:7: SyntaxError: Unexpected strict mode reserved word
+  function yield() {}
+           ^^^^^
+SyntaxError: Unexpected strict mode reserved word

test/message/nf-yield-strict.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.
+
+function yield() { "use strict"; }

test/message/nf-yield-strict.out

+*%(basename)s:5: SyntaxError: Unexpected strict mode reserved word
+function yield() { "use strict"; }
+         ^^^^^
+SyntaxError: Unexpected strict mode reserved word

test/message/nfe-yield-generator.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.
+
+(function* yield() {})

test/message/nfe-yield-generator.out

+*%(basename)s:5: SyntaxError: Unexpected identifier
+(function* yield() {})
+           ^^^^^
+SyntaxError: Unexpected identifier

test/message/nfe-yield-strict.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.
+
+(function yield() { "use strict"; })

test/message/nfe-yield-strict.out

+*%(basename)s:5: SyntaxError: Unexpected strict mode reserved word
+(function yield() { "use strict"; })
+          ^^^^^
+SyntaxError: Unexpected strict mode reserved word