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By simply removing
~_Mutex_base
. This destructor has been only a debug check since GH-3770. Losing the debug check is a small price to pay to elide the destructor call, doubly so for static storage duration mutexes that now won't need dynamic initializers to register withat_exit
._Mtx_destroy
and_Mtx_destroy_in_situ
are only called by APIs preserved for binary compatibility, so mark them as also "preserved for binary compatibility".