Handle the case that a member is directly used in a member bounds.
We'll handle the case where a member of a member is used later.

There are 3 situations that we handle:
1. Address-taken members used in a bounds declarations.
2. Address-taken members used in a bounds-safe interface.
- To avoid producing errors for existing code, it is not an error in
  an unchecked scope.
- It is an error if this is done in a checked scope.

- When computing paths, skip lvalue bit casts introduced for bunds-safe
  interfaces.
- Don't give an error for taking the address of an array with bounds.