Fix issue 1361 - Implement ES5 Array.prototype.toString.

test/mjsunit/regress/regress-877615.js

Index: test/mjsunit/regress/regress-877615.js
diff --git a/test/mjsunit/regress/regress-877615.js b/test/mjsunit/regress/regress-877615.js
index d35aba62d3aacd749893a50186be162fec5aeea4..bec5a4d1b8d6e209cdde41c383a89824a4ce5726 100644
--- a/test/mjsunit/regress/regress-877615.js
+++ b/test/mjsunit/regress/regress-877615.js
@@ -25,13 +25,13 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-Number.prototype.toLocaleString = function() { return 'invalid'};
-assertEquals([1].toLocaleString(), 'invalid');  // invalid
+Number.prototype.toLocaleString = function() { return 'invalid'; };
+assertEquals('invalid', [1].toLocaleString());  // invalid
 
 Number.prototype.toLocaleString = 'invalid';
-assertEquals([1].toLocaleString(), '1');  // 1
+assertThrows(function() { [1].toLocaleString(); });  // Not callable.
 
+delete Number.prototype.toLocaleString;
 Number.prototype.toString = function() { return 'invalid' };
-assertEquals([1].toLocaleString(), '1');  // 1
-assertEquals([1].toString(), '1');        // 1
-
+assertEquals([1].toLocaleString(), 'invalid');  // Uses ToObject on elements.
+assertEquals([1].toString(), '1');        // Uses ToString directly on elements.