Fix the indexing of Array builtin functions.

The index-dependant builtins didn't handle correctly the positive Infinity value.

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

tests/jerry/array-prototype-indexof.js

@@ -33,6 +33,10 @@ var index = array.indexOf(obj);
 assert(index === 3);
 assert(array[index] === obj);
 
+assert(array.indexOf("foo", NaN) === 0);
+assert(array.indexOf("foo", Infinity) === -1);
+assert(array.indexOf("foo", -Infinity) === 0);
+
 // Checking behavior when length is zero
 var obj = { indexOf : Array.prototype.indexOf, length : 0 };
 assert(obj.indexOf("foo") === -1);