Merge pull request #1187 from leobalter/follow-up-1050

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

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

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

src/dstr-binding-for-await/obj-ptrn-rest-nested-obj.case

...dstr-binding-for-await/obj-ptrn-rest-obj-nested-rest.case

...str-binding-for-await/obj-ptrn-rest-obj-own-property.case

src/spread/mult-err-obj-getter-throws.case

src/spread/mult-obj-base.case

src/spread/mult-obj-empty.case

src/spread/mult-obj-null-empty-undefined.case

src/spread/obj-setter-redef.case

src/spread/sngl-err-obj-getter-throws.case

src/spread/sngl-obj-base.case

src/spread/sngl-obj-empty.case

...xpressions/array/spread-err-mult-err-obj-getter-throws.js

...xpressions/array/spread-err-sngl-err-obj-getter-throws.js

test/language/expressions/array/spread-mult-obj-base.js

test/language/expressions/array/spread-mult-obj-empty.js

...expressions/array/spread-mult-obj-null-empty-undefined.js

test/language/expressions/array/spread-obj-setter-redef.js