Commit [c86681] Maximize Restore History

threads: Thread objects don't need a lowtag.

* It was a cute hack, in a way, to force the existing genesis
machinery to produce assembler symbols for thread structure slots.
But it's still a hack, and needs to die. And now it can.

Alastair Bridgewater Alastair Bridgewater 2011-10-25

changed src/compiler/generic/objdef.lisp
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