Test for [no LineTerminator here] after 'async' for arrows and methods

test/language/expressions/async-arrow-function/early-errors-arrow-formals-lineterminator.js

+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-AsyncArrowHead
+description: async arrows cannot have a line terminator between "async" and the formals
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+async
+(foo,bar) => { }

test/language/expressions/async-arrow-function/early-errors-arrow-ident-lineterminator.js

+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-AsyncArrowFunction
+description: async arrows cannot have a line terminator between "async" and the AsyncArrowBindingIdentifier
+negative:
+  phase: early
+  type: ReferenceError
+---*/
+
+async
+foo => { }

test/language/expressions/object/method-definition/early-errors-object-method-async-lineterminator.js

+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-AsyncMethod
+description: async methods cannot have a line terminator between "async" and the property name
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+{
+  async
+  foo () { }
+}