Improve time taken to free memory when ISC_MEM_DEBUGRECORD is set.
Improve time taken to free memory when ISC_MEM_DEBUGRECORD is set.

pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab