Check for read-only-ness when preparing for array sort.

test/mjsunit/regress/regress-2419.js

Index: test/mjsunit/regress/regress-2419.js
diff --git a/test/mjsunit/regress/regress-crbug-160010.js b/test/mjsunit/regress/regress-2419.js
similarity index 94%
copy from test/mjsunit/regress/regress-crbug-160010.js
copy to test/mjsunit/regress/regress-2419.js
index 266e54532597d060b699788fc210d566941fba60..b8ba7b139d4b48fc98e866c73d1fc34362c3b689 100644
--- a/test/mjsunit/regress/regress-crbug-160010.js
+++ b/test/mjsunit/regress/regress-2419.js
@@ -25,9 +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.
 
-var str = "a";
-for (var i = 0; i < 28; i++) {
-  str += str;
-}
-JSON.stringify(str);
+var a = [5, 4, 3, 2, 1, 0];
+Object.freeze(a);
+a.sort();
+assertArrayEquals([5, 4, 3, 2, 1, 0], a);