Add copyright notice to new test case.

test/mjsunit/regress/regress-AddElement.js

Index: test/mjsunit/regress/regress-AddElement.js
===================================================================
--- test/mjsunit/regress/regress-AddElement.js	(revision 1513)
+++ test/mjsunit/regress/regress-AddElement.js	(working copy)
@@ -1,29 +0,0 @@
-// Flags: --always-compact
-//
-// Regression test for the r1512 fix.
-
-var foo = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
-
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-foo = foo + foo;
-
-foo.replace(/[b]/, "c");  // Flatten foo;
-
-var moving_string = "b" + "c";
-
-var bar = foo.replace(/[a]/g, moving_string);
-
-print(bar.length);