Commit [f63d03] Maximize Restore History

Fix build of new SYMBOL-INFO magic on targets without compare-and-swap-vops.

* The (non-atomic) fallback position for compare-and-swap
requires some way to set the target value, which can be provided
as an explicit function name or will default to a SETF function.

* Define (SETF SYMBOL-INFO) as a :SET-TRANS for the SYMBOL-INFO
slot and provide an interpreter stub for it.

Alastair Bridgewater Alastair Bridgewater 2014-03-23

changed src/code/symbol.lisp
changed src/compiler/generic/objdef.lisp
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