Improve coverage for line terminators

Previous commits restructured the tests for line terminators and made
coverage gaps more apparent. Introduce new files to improve coverage.

test/language/line-terminators/comment-multi-ps.js

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+// Copyright 2019 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Multi line comment can contain PARAGRAPH SEPARATOR (U+2029)
+esid: sec-line-terminators
+es5id: 7.3_A5.1_T2
+description: Insert real PARAGRAPH SEPARATOR into multi line comment
+negative:
+  phase: runtime
+  type: Test262Error
+---*/
+
+// Because this test concerns the interpretation of non-executable character
+// sequences within ECMAScript source code, special care must be taken to
+// ensure that executable code is evaluated as expected.
+//
+// Express the intended behavior by intentionally throwing an error; this
+// guarantees that test runners will only consider the test "passing" if
+// executable sequences are correctly interpreted as such.
+
+var x = 0;
+
+/*
x = 1;
*/
+
+if (x === 0) {
+  throw new Test262Error();
+}

test/language/line-terminators/invalid-regexp-cr.js

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+// Copyright 2019 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-line-terminators
+es5id: 7.3-7
+description: >
+    7.3 - ES5 recognizes the character <CR> (\u000D) as terminating
+    regular expression literals
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/
/

test/language/line-terminators/invalid-regexp-lf.js

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+// Copyright 2019 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-line-terminators
+es5id: 7.3-7
+description: >
+    7.3 - ES5 recognizes the character <LF> (\u000A) as terminating
+    regular expression literals
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/
+/

test/language/line-terminators/invalid-string-ls.js

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+// Copyright 2019 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: LINE SEPARATOR (U+2028) within strings is not allowed
+es5id: 7.3_A2.2_T1
+esid: sec-line-terminators
+description: Insert LINE SEPARATOR (\u2028) into string
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+'
'

test/language/line-terminators/invalid-string-ps.js

@@ -0,0 +1,16 @@
+// Copyright 2019 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: PARAGRAPH SEPARATOR (U+2029) within strings is not allowed
+es5id: 7.3_A2.2_T1
+esid: sec-line-terminators
+description: Insert PARAGRAPH SEPARATOR (\u2029) into string
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+'
'