Commit [d077b2] Maximize Restore History

1.0.46.44: room: Fix map-stack-references for stack-grows-upward systems.

* SAP+ is (function (system-area-pointer integer) (values
system-area-pointer)).

* SAP- is (function (system-area-pointer system-area-pointer) (values
integer)).

* When negating the delta in a SAP+ operation, don't use SAP-.
Instead, negate the offset. Otherwise, you get a WARNING for passing an
integer where a system-area-pointer is expected.

Alastair Bridgewater Alastair Bridgewater 2011-03-24

changed src/code/room.lisp
changed version.lisp-expr
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