1.0.23.35: CLOS tweaking

1.0.23.35: CLOS tweaking

 * Muffle undefined function style-warning for slot-accessors. The
   slot-accessor name is an internal detail, and defining functions
   accessing slots before classes with such slots are defined is fine.

 * Don't double-fetch slot-definition-initfunction in
   SHARED-INITIALIZE (SLOT-OBJECT).

 * Don't double-fetch various slot-definition properties in
   COMPUTE-EFFECTIVE-SLOT-DEFINITION-INITARGS, and declare
   type-check-functions as functions.