Commit [2a6ba7] Maximize Restore History

De-cruft CLEAN-UP-PACK-STRUCTURES. Empty bit vectors are not a problem.

And FINITE-SB-ALWAYS-LIVE-COUNT was just plain wrong - it's not
a vector of vectors, but didn't matter. Proper semantics resulted from
resetting elsewhere; this one was supposed to smash pointers for GC.

Douglas Katzman Douglas Katzman 2014-06-29

changed src/compiler/pack.lisp
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