Add tests for destructuring assignment

...xpressions/assignment/destructuring/array-elem-elision.js

...ns/assignment/destructuring/array-elem-init-assignment.js

...ns/assignment/destructuring/array-elem-init-evaluation.js

...xpressions/assignment/destructuring/array-elem-init-in.js

...pressions/assignment/destructuring/array-elem-init-let.js

...essions/assignment/destructuring/array-elem-init-order.js

...ignment/destructuring/array-elem-init-simple-no-strict.js

...assignment/destructuring/array-elem-init-simple-strict.js

...ns/assignment/destructuring/array-elem-init-yield-expr.js

...ment/destructuring/array-elem-init-yield-ident-invalid.js

...gnment/destructuring/array-elem-init-yield-ident-valid.js

...signment/destructuring/array-elem-nested-array-invalid.js

.../assignment/destructuring/array-elem-nested-array-null.js

...t/destructuring/array-elem-nested-array-undefined-hole.js

...nt/destructuring/array-elem-nested-array-undefined-own.js

...gnment/destructuring/array-elem-nested-array-undefined.js

...nment/destructuring/array-elem-nested-array-yield-expr.js

...tructuring/array-elem-nested-array-yield-ident-invalid.js

...estructuring/array-elem-nested-array-yield-ident-valid.js

...sions/assignment/destructuring/array-elem-nested-array.js