Merge pull request #934 from leobalter/flags-object-rest-spread

src/dstr-assignment/obj-rest-descriptors.case

src/dstr-assignment/obj-rest-empty-obj.case

src/dstr-assignment/obj-rest-getter-abrupt-get-error.case

src/dstr-assignment/obj-rest-getter.case

src/dstr-assignment/obj-rest-nested-obj-nested-rest.case

src/dstr-assignment/obj-rest-nested-obj.case

src/dstr-assignment/obj-rest-not-last-element-invalid.case

src/dstr-assignment/obj-rest-number.case

src/dstr-assignment/obj-rest-obj-own-property.case

src/dstr-assignment/obj-rest-put-const.case

src/dstr-assignment/obj-rest-same-name.case

src/dstr-assignment/obj-rest-skip-non-enumerable.case

src/dstr-assignment/obj-rest-str-val.case

src/dstr-assignment/obj-rest-symbol-val.case

src/dstr-assignment/obj-rest-to-property-with-setter.case

src/dstr-assignment/obj-rest-to-property.case

src/dstr-assignment/obj-rest-val-null.case

src/dstr-assignment/obj-rest-val-undefined.case

src/dstr-assignment/obj-rest-valid-object.case

src/dstr-binding/obj-ptrn-rest-getter.case