Commit [ae9741] Maximize Restore History

genesis: Export assembly slot offsets for primitive-objects without lowtags.

* If a primitive-object has no lowtag, export its slot offsets
to assembly language as if it had a lowtag of zero.

* While we're here, use SYMBOL-VALUE instead of EVAL to find the
numeric value of a lowtag.

Alastair Bridgewater Alastair Bridgewater 2011-10-25

changed src/compiler/generic/genesis.lisp
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