Fix new ArrayBuffer(length) for variaous input (#1959)

Currently new ArrayBuffer(length) does not conform to ES2017.
Major JS implementations follow ES2017 for ArrayBuffer(length).

For example, new ArrayBuffer(length) should not throw RangeError
for length = NaN, undefined, negative number, floating point, and so on.

JerryScript-DCO-1.0-Signed-off-by: Sanggyu Lee sg5.lee@samsung.com

tests/jerry-test-suite/es2015/24/24.01/24.01.02/24.01.02-007.js

@@ -13,15 +13,5 @@
  * limitations under the License.
  */
 
-var name = "";
-
-try
-{
-  var a = new ArrayBuffer("string");
-}
-catch (e)
-{
-  name = e.name;
-}
-
-assert(name === "RangeError");
+var a = new ArrayBuffer("string");
+assert(a.byteLength === 0);