A few more tests

- Tests for the new macroexpansion-time type translator interface:
  MISC-TYPES.EXPAND.[1234]
- New tests: DEREF.LONG-LONG and DEREF.UNSIGNED-LONG-LONG.
- Tests for mem-ref with non-constant type arguments: DEREF.NONCONST.*
- Fix some comments in tests/memory.lisp.
- New test: MISC-TYPES.BOOLEAN.2 (accepting typedefs to integer types)