NewGC: Merge bleeding edge up to 9009.

test/mjsunit/regress/regress-1620.js

 // 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 34 matching lines @@
 // Handle 0xFFFD correctly (it's a valid value, and shouldn't be used
 // to mark an error).
 assertEquals(0xFFFD, "\uFFFD".charCodeAt(0));
 
 // Handle unicode escapes in regexp flags correctly.
 assertThrows("/x/g\\uim", SyntaxError);
 assertThrows("/x/g\\u2im", SyntaxError);
 assertThrows("/x/g\\u22im", SyntaxError);
 assertThrows("/x/g\\u222im", SyntaxError);
 assertThrows("/x/g\\\\u2222im", SyntaxError);