Fix parse of delete operator.

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

tests/jerry/delete.js

@@ -12,17 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-var a = 1;
-assert (a === 1);
-assert (delete a === false);
-assert (a === 1);
+/* argument is not reference */
+assert (delete 0 === true);
+assert (delete "0" === true);
+assert (delete (a = 1) === true);
+assert (delete delete a === true);
+
+/* argument is unresolvable reference */
+assert (delete undefined_variable === true);
+
+/* argument is object-based reference */
 var a = [1];
 assert (a[0] === 1);
 assert (delete a[0] === true);
 assert (a[0] == undefined);
-assert (delete 0 === true);
-assert (delete "0" === true);
+
 var b = {c:0};
 assert (b.c === 0);
 assert (delete b.c === true);
 assert (b.c === undefined);
+
+/* argument is lexical environment-based reference */
+var a = 1;
+assert (a === 1);
+assert (delete a === false);
+assert (a === 1);