Commit [a32e30] Maximize Restore History

Minor lowtag-handling cleanup in genesis.

* Instead of explicitly testing a lowtag against two or four
constants (with scary reader conditionals for making the decision)
to determine if a given lowtag is an other-immediate, introduce a
function, IS-OTHER-IMMEDIATE-LOWTAG, paralleling IS-FIXNUM-LOWTAG,
with commentary, operating along the same lines as a similar
function in runtime.h.

Alastair Bridgewater Alastair Bridgewater 2011-10-26

changed src
changed src/compiler
changed src/compiler/generic
changed src/compiler/generic/genesis.lisp
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