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

test/built-ins/Object/defineProperty/15.2.3.6-0-1.js

test/built-ins/Object/defineProperty/15.2.3.6-0-2.js

test/built-ins/Object/defineProperty/15.2.3.6-2-1.js

test/built-ins/Object/defineProperty/15.2.3.6-2-10.js

test/built-ins/Object/defineProperty/15.2.3.6-2-11.js

test/built-ins/Object/defineProperty/15.2.3.6-2-12.js

test/built-ins/Object/defineProperty/15.2.3.6-2-13.js

test/built-ins/Object/defineProperty/15.2.3.6-2-14.js

test/built-ins/Object/defineProperty/15.2.3.6-2-15.js

test/built-ins/Object/defineProperty/15.2.3.6-2-16.js

test/built-ins/Object/defineProperty/15.2.3.6-2-17-1.js

test/built-ins/Object/defineProperty/15.2.3.6-2-17.js

test/built-ins/Object/defineProperty/15.2.3.6-2-18.js

test/built-ins/Object/defineProperty/15.2.3.6-2-19.js

test/built-ins/Object/defineProperty/15.2.3.6-2-2.js

test/built-ins/Object/defineProperty/15.2.3.6-2-20.js

test/built-ins/Object/defineProperty/15.2.3.6-2-21.js

test/built-ins/Object/defineProperty/15.2.3.6-2-22.js

test/built-ins/Object/defineProperty/15.2.3.6-2-23.js

test/built-ins/Object/defineProperty/15.2.3.6-2-24.js