Commit [d8422b] Maximize Restore History

Preserve superclass structure accessors in infodb

Do not overwrite inherited structure accessor entries in infodb when
a sub-structure-class gets defined with same conc-name.

Fixes CAS access to slots of direct superclass instances in this
case (and in particular, non-futex safepoint builds).

David Lichteblau David Lichteblau 2012-12-17

changed src/code/defstruct.lisp
changed tests/compare-and-swap.impure.lisp
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