* for-of: IteratorClose spec compatibility. See #3: https://tc39.github.io/ecma262/#sec-iteratorclose * Update spec fixtures for for-of. * Fix IteratorClose case for remap-async-to-generator. * Fix IteratorClose case for async-generator-function test output. * Modify few tests according to iteratorClose fix. * Fix iteratorClose for helpers.slicedToArray also. * Update iteratorClose fixture for commonjs.