Export symbol CLASS-OF so that it can be imported in other phases.
Provide an indirection to MAKE-INSTANCE-DEFAULT.
Provide an indirection to SHARED-INITIALIZE-DEFAULT.
Export indirection variables for MAKE-INSTANCE and SHARED-INITIALIZE.
Export more entry points.
Added SHARED-INITALIZE-DEFAULT as component in phase 2.
Import CLASS-OF and STANDARD-INSTANCE-ACCESS from phase 1.
Import SLOT-... functions from phase 2, to be used for initialization.
Shadow MAKE-INSTANCE so that we can define it in phase 3.
Redefine SHARED-INITIALIZE-DEFAULT in phase 3 to use target classes.
Redefine MAKE-INSTANCE in phase 3.
Modify indirections in phase 3.