Replace runTestCase with assert helpers [test/built-ins/Object/getOwnPropertyDescriptor]

...built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-0-1.js

...built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-0-2.js

...built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-1-3.js

...built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-1-4.js

test/built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-1.js

...built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-1.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-10.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-11.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-12.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-13.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-14.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-15.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-16.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-17.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-18.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-19.js

...built-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-2.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-20.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-21.js

...uilt-ins/Object/getOwnPropertyDescriptor/15.2.3.3-2-22.js