[regexp] Fix matching of regexps that are both sticky and anchored at end.

test/mjsunit/es6/regexp-sticky.js

 // Copyright 2014 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
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@@ skipping 110 matching lines @@
 // beginning of a line.
 var hat = /^foo/y;
 hat.lastIndex = 2;
 assertFalse(hat.test("..foo"));
 
 var mhat = /^foo/my;
 mhat.lastIndex = 2;
 assertFalse(mhat.test("..foo"));
 mhat.lastIndex = 2;
 assertTrue(mhat.test(".\nfoo"));
+
+// Check that we don't apply incorrect optimization to sticky regexps that
+// are anchored at end.
+var stickyanchored = /bar$/y;
+assertFalse(stickyanchored.test("foobar"));
+stickyanchored.lastIndex = 3;
+assertTrue(stickyanchored.test("foobar"));