Guard BasicObject#instance_eval from segfault
Guard BasicObject#instance_eval from segfault

Before
```
$ bin/topaz -e 'instance_eval'
[1]    59886 segmentation fault  bin/topaz -e 'instance_eval'
```

After
```
$ bin/topaz -e 'instance_eval'
-e:1:in `instance_eval': block not supplied (ArgumentError)
```

topazproject/topaz,topazproject/topaz,babelsberg/babelsberg-r,babelsberg/babelsberg-r,topazproject/topaz,babelsberg/babelsberg-r,babelsberg/babelsberg-r,babelsberg/babelsberg-r,topazproject/topaz