Merge pull request #241 from bocoup/set

test/built-ins/Set/constructor.js

test/built-ins/Set/length.js

test/built-ins/Set/name.js

test/built-ins/Set/properties-of-the-set-prototype-object.js

test/built-ins/Set/prototype-of-set.js

...s/Set/prototype/Symbol.iterator/next-iteration-mutable.js

...built-ins/Set/prototype/Symbol.iterator/next-iteration.js

...ilt-ins/Set/prototype/Symbol.iterator/next-no-set-data.js

...-ins/Set/prototype/Symbol.iterator/property-descriptor.js

...totype/Symbol.iterator/toStringTag-property-descriptor.js

...s/Set/prototype/Symbol.toStringTag/property-descriptor.js

test/built-ins/Set/prototype/add/add.js

...rototype/add/does-not-have-setdata-internal-slot-array.js

.../prototype/add/does-not-have-setdata-internal-slot-map.js

...ototype/add/does-not-have-setdata-internal-slot-object.js

.../add/does-not-have-setdata-internal-slot-set-prototype.js

...totype/add/does-not-have-setdata-internal-slot-weakset.js

test/built-ins/Set/prototype/add/length.js

test/built-ins/Set/prototype/add/name.js

.../built-ins/Set/prototype/add/preserves-insertion-order.js