Add regular RegExp Unicode property escape tests (#1014)

Ref. https://github.com/mathiasbynens/unicode-property-escapes-tests/pull/8.

test/built-ins/RegExp/property-escapes/binary-properties-with-value.js

+// Copyright 2017 Mathias Bynens. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Mathias Bynens
+description: >
+  Binary properties with an explicit value must throw in Unicode property
+  escapes (even if the value is valid).
+esid: sec-static-semantics-unicodematchproperty-p
+features: [regexp-unicode-property-escapes]
+---*/
+
+assert.throws.early(SyntaxError, "/\\p{ASCII=Yes}/u");
+assert.throws.early(SyntaxError, "/\\p{ASCII=Y}/u");
+assert.throws.early(SyntaxError, "/\\p{ASCII=T}/u");
+
+assert.throws.early(SyntaxError, "/\\P{ASCII=No}/u");
+assert.throws.early(SyntaxError, "/\\P{ASCII=N}/u");
+assert.throws.early(SyntaxError, "/\\P{ASCII=F}/u");
+
+assert.throws.early(SyntaxError, "/\\p{ASCII=Invalid}/u");

test/built-ins/RegExp/property-escapes/character-class.js

+// Copyright 2017 Mathias Bynens. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Mathias Bynens
+description: >
+  Unicode property escapes must be supported in character classes.
+esid: sec-static-semantics-unicodematchproperty-p
+features: [regexp-unicode-property-escapes]
+---*/
+
+/[\p{Hex}]/u;
+assert(
+  /[\p{Hex}-\uFFFF]/u.test('-'),
+  'property escape in character class should not be parsed as the start of a range'
+);
+assert.throws.early(SyntaxError, "/[\\p{}]/u");
+assert.throws.early(SyntaxError, "/[\\p{invalid}]/u");
+assert.throws.early(SyntaxError, "/[\\p{]/u");
+assert.throws.early(SyntaxError, "/[\\p{]}/u");
+assert.throws.early(SyntaxError, "/[\\p}]/u");
+assert(
+  /[\p{Hex}\P{Hex}]/u.test('\u{1D306}'),
+  'multiple property escapes in a single character class should be supported'
+);