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/es2015/24/24.01/24.01.02/24.01.02-002.js

@@ -15,3 +15,4 @@
 
 var a = new ArrayBuffer(5);
 assert(typeof a === 'object');
+assert(a.byteLength === 5);