Merge pull request #259 from smikes/more-strict-object-property

test/built-ins/Object/defineProperty/15.2.3.6-4-354-8.js

test/built-ins/Object/defineProperty/15.2.3.6-4-360-3.js

test/built-ins/Object/defineProperty/15.2.3.6-4-531-7.js

test/built-ins/Object/defineProperty/15.2.3.6-4-531-8.js

test/built-ins/Object/defineProperty/15.2.3.6-4-537.js

test/built-ins/Object/defineProperty/15.2.3.6-4-54.js

test/built-ins/Object/defineProperty/15.2.3.6-4-542.js

test/built-ins/Object/defineProperty/15.2.3.6-4-546.js

test/built-ins/Object/defineProperty/15.2.3.6-4-555.js

test/built-ins/Object/defineProperty/15.2.3.6-4-560.js

test/built-ins/Object/defineProperty/15.2.3.6-4-564.js

test/built-ins/Object/defineProperty/15.2.3.6-4-581.js

test/built-ins/Object/defineProperty/15.2.3.6-4-586.js

test/built-ins/Object/defineProperty/15.2.3.6-4-591.js

test/built-ins/Object/defineProperty/15.2.3.6-4-596.js

test/built-ins/Object/defineProperty/15.2.3.6-4-63.js

test/built-ins/Object/defineProperty/15.2.3.6-4-85.js