[cfe-dev] Resuming work on n-bit chars

[Ken Dyck]

FYI, I am resuming my long-neglected work on n-bit char types,
starting with r123421. This work entails replacing literal '8's with
calls to ASTContest::getCharWidth() and generally expanding the usage
of CharUnits wherever calculations are currently performed in
byte/char units.

Cheers,
-Ken