Backed out Bob Relyea's workaround for the deadlock in rev. 1.15.  The correct fix is in rev. 1.36 of tdcache.c (see Bugzilla bug 212112).
Backed out Bob Relyea's workaround for the deadlock in rev. 1.15.  The
correct fix is in rev. 1.36 of tdcache.c (see Bugzilla bug 212112).

nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss