Commit [f3a7c6] Maximize Restore History

1.0.6.59: bogus metacircles due to interrupted applicable method comp.

* If an interrupt arrives while have stuff on the *CACHE-MISS-VALUES-STACK*
and the interrupt handler happens to call a gf that is already there,
we used to think this was a metacircle. Instead we need to bind
variables like this to "empty" values for interrupt hanlers.

* Test.

* Note some bugs.

Nikodemus Siivola Nikodemus Siivola 2007-06-20

changed src/code/early-impl.lisp
changed src/code/target-signal.lisp
changed src/code/target-thread.lisp
changed src/runtime/gencgc.c
changed BUGS
changed NEWS
changed package-data-list.lisp-expr
changed version.lisp-expr
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