Reland "Make Array.prototype.pop throw if the last element is not configurable."

test/mjsunit/regress/regress-array-pop-nonconfigurable.js

Index: test/mjsunit/regress/regress-array-pop-nonconfigurable.js
diff --git a/test/mjsunit/regress/regress-173361.js b/test/mjsunit/regress/regress-array-pop-nonconfigurable.js
similarity index 95%
copy from test/mjsunit/regress/regress-173361.js
copy to test/mjsunit/regress/regress-array-pop-nonconfigurable.js
index f9cfb6684c0d52996c7ceac8412defbaf48a5eeb..129e1980a446bee71e99a04076f46d1cd4d00b5c 100644
--- a/test/mjsunit/regress/regress-173361.js
+++ b/test/mjsunit/regress/regress-array-pop-nonconfigurable.js
@@ -25,9 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony
+var a = [];
+Object.defineProperty(a, 0, {});
+assertThrows(function() { a.pop(); });
 
-const x = 7;
-
-function f() { const y = 8; }
-f();