[Bug c++/50495] Optimize exact matches in overload resolution

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50495

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-09-23 16:00:37 UTC ---
(In reply to comment #3)
> I recently made a number of improvements that will be in 4.7.0; see PR 48481.

The fn_set change in particular should cut your overload resolution time by
50%.  The other changes are to avoid memory bloat, which may or may not affect
you.