[Bug libstdc++/53263] priority_queue is very slow if -D_GLIBCXX_DEBUG is used

[pluto at agmk dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53263

--- Comment #5 from Pawel Sikora <pluto at agmk dot net> 2012-05-07 13:34:43 
UTC ---
callgrind shows that n*10e3 of pq.push() generates m*10e6 (m>n)
_M_can_advance() calls and growing fast :)