[regexp] implement \p{Other_ID_Start} and \p{Other_ID_Continue}.

test/mjsunit/harmony/regexp-property-special.js

 // Copyright 2016 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.
 
 // Flags: --harmony-regexp-property
 
 function t(re, s) { assertTrue(re.test(s)); }
 function f(re, s) { assertFalse(re.test(s)); }
 
 t(/\p{ASCII}+/u, "abc123");
@@ skipping 26 matching lines @@
 t(/\p{Assigned}+/u, "🄰🄱🄲");
 f(/\p{Assigned}+/u, "\ufdd0");
 f(/\p{Assigned}+/u, "\u{fffff}");
 
 f(/\P{Assigned}+/u, "123");
 f(/\P{Assigned}+/u, "🄰🄱🄲");
 t(/\P{Assigned}+/u, "\ufdd0");
 t(/\P{Assigned}+/u, "\u{fffff}");
 f(/\P{Assigned}/u, "");
 
-t(/[^\P{Assigned}]+/u, "123");
-f(/[\P{Assigned}]+/u, "🄰🄱🄲");
-f(/[^\P{Assigned}]+/u, "\ufdd0");
-t(/[\P{Assigned}]+/u, "\u{fffff}");
-f(/[\P{Assigned}]/u, "");
+f(/[^\u1234\p{ASCII}]+/u, "\u1234");
+t(/[x\P{ASCII}]+/u, "x");
+t(/[\u1234\p{ASCII}]+/u, "\u1234");
+
+t(/^\p{Other_ID_Start}+$/u, "\u1885\u1886\u2118\u212e\u309b\u309c");
+f(/\P{OIDS}/u, "\u1885\u1886\u2118\u212e\u309b\u309c");
+f(/^[x\P{Other_ID_Start}]+$/u, "\u1885\u1886\u2118\u212e\u309b\u309cx");
+f(/[x\P{OIDS}]/u, "\u1885\u1886\u2118\u212e\u309b\u309c");
+
+var other_id_continue = "\u00b7\u0387\u1369\u136a\u136b\u136c" +
+                        "\u136d\u136e\u136f\u1370\u1371\u19da";
+t(/^\p{Other_ID_Continue}+$/u, other_id_continue);
+f(/\P{OIDC}/u, other_id_continue);