Add alignment test case with preprocessing conditionals.
Add alignment test case with preprocessing conditionals.

Documents what is known to work at this time.

Aligning across preprocessing directives would be easy to implement if so
desired.

issues #357

PiperOrigin-RevId: 333390932

chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible