Land test case for RegExp.source.

test/mjsunit/regress/regress-447561.js

Index: test/mjsunit/regress/regress-447561.js
diff --git a/test/mjsunit/compiler/regress-ntl-effect.js b/test/mjsunit/regress/regress-447561.js
similarity index 53%
copy from test/mjsunit/compiler/regress-ntl-effect.js
copy to test/mjsunit/regress/regress-447561.js
index 708fe32828c9197dfa3d8c371ab01cbc1ad3317a..0d7a321de0255805485053e6dfd618ad7fec6261 100644
--- a/test/mjsunit/compiler/regress-ntl-effect.js
+++ b/test/mjsunit/regress/regress-447561.js
@@ -2,15 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax
-
-function g() {
-  throw 0;
-}
-
-function f() {
-  g();
-  while (1) {}
-}
-
-assertThrows(function () { f(); });
+__proto__ = /foo/gi;
+assertEquals("foo", source);
+assertTrue(global);
+assertTrue(ignoreCase);
+assertFalse(multiline);
+assertEquals(0, lastIndex);