Added test for FOR-THE-HASH-KEYS-OF with destructuring of USING variable.
Added test for FOR-THE-HASH-KEYS-OF with destructuring of USING variable.

clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL