Revert of [regexp] implement character classes for unicode regexps.

test/mjsunit/harmony/unicode-escapes-in-regexps.js

 // Copyright 2014 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.
 
 // ES6 extends the \uxxxx escape and also allows \u{xxxxx}.
 
 // Flags: --harmony-unicode-regexps --harmony-regexps
 
 function testRegexpHelper(r) {
   assertTrue(r.test("foo"));
@@ skipping 234 matching lines @@
     "\u{12345}b\u{12345}"));
 assertTrue(/(\u{12345}|\u{23456}).\1/u.test("\u{12345}b\u{12345}"));
 assertFalse(new RegExp("(\u{12345}|\u{23456}).\\1", "u").test(
     "\u{12345}b\u{23456}"));
 assertFalse(/(\u{12345}|\u{23456}).\1/u.test("\u{12345}b\u{23456}"));
 
 // Quantifier.
 assertTrue(new RegExp("\u{12345}{3}", "u").test("\u{12345}\u{12345}\u{12345}"));
 assertTrue(/\u{12345}{3}/u.test("\u{12345}\u{12345}\u{12345}"));
 assertTrue(new RegExp("\u{12345}{3}").test("\u{12345}\udf45\udf45"));
-assertFalse(/\ud808\udf45{3}/u.test("\u{12345}\udf45\udf45"));
-assertTrue(/\ud808\udf45{3}/u.test("\u{12345}\u{12345}\u{12345}"));
+assertTrue(/\ud808\udf45{3}/u.test("\u{12345}\udf45\udf45"));
 assertFalse(new RegExp("\u{12345}{3}", "u").test("\u{12345}\udf45\udf45"));
 assertFalse(/\u{12345}{3}/u.test("\u{12345}\udf45\udf45"));
-
-// Mixed escapes and literal surrogates.
-assertEquals(["\u{10000}\u{10000}"],
-             new RegExp("\ud800\udc00+", "u").exec("\u{10000}\u{10000}"));
-assertEquals(["\u{10000}\u{10000}"],
-             new RegExp("\\ud800\\udc00+", "u").exec("\u{10000}\u{10000}"));
-assertEquals(["\u{10000}\u{10000}"],
-             new RegExp("\\ud800\udc00+", "u").exec("\u{10000}\u{10000}"));
-assertEquals(["\u{10000}\u{10000}"],
-             new RegExp("\ud800\\udc00+", "u").exec("\u{10000}\u{10000}"));
-
-assertEquals(["\u{10003}\u{50001}"],
-             new RegExp("[\\ud800\\udc03-\\ud900\\udc01\]+", "u").exec(
-                 "\u{10003}\u{50001}"));
-assertEquals(["\u{10003}\u{50001}"],
-             new RegExp("[\\ud800\udc03-\ud900\\udc01\]+", "u").exec(
-                 "\u{10003}\u{50001}"));
-assertEquals(["\u{50001}"],
-             new RegExp("[\\ud800\udc03-\ud900\\udc01\]+", "u").exec(
-                 "\u{10002}\u{50001}"));
-assertEquals(["\u{10003}\u{50001}"],
-             new RegExp("[\ud800\udc03-\u{50001}\]+", "u").exec(
-                 "\u{10003}\u{50001}"));