Add workaround for redefinition of __proto__ property.

test/mjsunit/regress/regress-2565.js

Index: test/mjsunit/regress/regress-2565.js
diff --git a/test/mjsunit/regress/regress-crbug-172345.js b/test/mjsunit/regress/regress-2565.js
similarity index 91%
copy from test/mjsunit/regress/regress-crbug-172345.js
copy to test/mjsunit/regress/regress-2565.js
index 711501caa791f2974635ac4dd894568a2e3fc982..a77806a62e2209d355fce393b98797f1d20f40f8 100644
--- a/test/mjsunit/regress/regress-crbug-172345.js
+++ b/test/mjsunit/regress/regress-2565.js
@@ -25,10 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function f(a,i) {
-  return a[i];
-}
-
-f([1,2,3], "length");
-f([1,2,3], "length");
-f([1,2,3], 2);
+Object.freeze(Object.prototype);
+var p = {};
+var o = Object.create(p);
+assertSame(p, o.__proto__);
+assertSame(p, Object.getPrototypeOf(o));