Fix illegal escape-sequences to throw syntax errors.

test/mozilla/mozilla.status

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 574 matching lines @@
 
 # Cannot call strings as functions. Expects not to crash.
 js1_5/Regress/regress-417893: FAIL_OK
 
 
 # Unsupported use of "[]" as function parameter. We match JSC.
 js1_5/Regress/regress-416737-01: FAIL_OK
 js1_5/Regress/regress-416737-02: FAIL_OK
 
 
+# Illegal escape-sequences in string literals. Has already been fixed
+# by most engines (i.e. V8, JSC, Opera and FF).
+ecma/Array/15.4.5.1-1: FAIL_OK
+ecma/LexicalConventions/7.7.4: FAIL_OK
+ecma_2/RegExp/hex-001: FAIL_OK
+js1_2/regexp/hexadecimal: FAIL_OK
+
+
 ##################### FAILING TESTS #####################
 
 # This section is for tests that fail in V8 and pass in JSC.
 # Tests that fail in both V8 and JSC belong in the FAIL_OK
 # category.
 
 # This fails because we don't handle Function.prototype.apply with very large
 # numbers of arguments (depending on max stack size).  350256-02 needs more than
 # 4Mbytes of stack space.
 js1_5/Array/regress-350256-02: FAIL
@@ skipping 314 matching lines @@
 ecma/Date/15.9.5.12-2: SKIP
 ecma/Date/15.9.5.8: SKIP
 ecma/Date/15.9.5.9: SKIP
 ecma/Date/15.9.5.11-2: SKIP
 ecma/Expressions/11.7.2: SKIP
 ecma/Expressions/11.10-2: SKIP
 ecma/Expressions/11.7.3: SKIP
 ecma/Expressions/11.10-3: SKIP
 ecma/Expressions/11.7.1: SKIP
 ecma_3/RegExp/regress-209067: SKIP