c-sh-E/c-sh-C dispatching randomness

[David Chapman <Zvona at OZ>]

In Symbolics 3600 Zwei in System 242.356, Hardcopy 20.10, FEP 24, on Lisp Machine Keith Moon:

It's awful random that c-sh-E dispatches off of an instance variable of
the buffer to get its evaluator function while c-sh-C calls the major
mode.  Makes figuring out how to write my own language support twice as
hard.  (All the code involved here is a tangled mess.)