[PATCH] Reduce gfc_match_strings usage

[François-Xavier Coudert]

> it was supported
> in principle by FX (who reconfirmed that gfc_match_strings is the
> "hottest" CPU hog in the gfortran front-end)

I can't reconfirm the timings, but I still support the patch (you can
drop the "in principle") ;-)

FX