Commit [eaeb81] Maximize Restore History

1.0.37.22: SB-PROFILE improvements

* More efficient counters: use CAS to increment the overflow, no need
for a separate spinlock.

* Current off-by-one in the event of counter-overflows.

* Report per-function GC overhead. (patch by John Fremlin)

Nikodemus Siivola Nikodemus Siivola 2010-04-01

changed src/code/profile.lisp
changed tests/profile.impure.lisp
changed NEWS
changed version.lisp-expr
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