Add tests for Reflect.setPrototypeOf

test/built-ins/Reflect/setPrototypeOf/length.js

test/built-ins/Reflect/setPrototypeOf/name.js

...setPrototypeOf/proto-is-not-object-and-not-null-throws.js

...uilt-ins/Reflect/setPrototypeOf/proto-is-symbol-throws.js

...t-ins/Reflect/setPrototypeOf/return-abrupt-from-result.js

...totypeOf/return-false-if-target-and-proto-are-the-same.js

...etPrototypeOf/return-false-if-target-is-not-extensible.js

...ototypeOf/return-false-if-target-is-prototype-of-proto.js

...ect/setPrototypeOf/return-true-if-new-prototype-is-set.js

...Reflect/setPrototypeOf/return-true-if-proto-is-current.js

test/built-ins/Reflect/setPrototypeOf/setPrototypeOf.js

...ins/Reflect/setPrototypeOf/target-is-not-object-throws.js

...ilt-ins/Reflect/setPrototypeOf/target-is-symbol-throws.js