so it doesn't have to compute it.
* src/tgbaparse/tgbascan.ll: Likewise.
(YY_USER_INIT, current_file): Remove, it is too costly to use
yy::Location::filename in the current implementation
of yy::Location (this attribute is duplicated for each token).
Leaving it empty divides the parsing time by 3.
* src/tgbaparse/fmterror.cc, src/tgbaparse/public.hh
(format_tgba_parse_errors): Take the filename as argument.
* src/tgbatest/explprod.cc, src/tgbatest/ltl2tgba.cc,
src/tgbatest/mixprod.cc, src/tgbatest/powerset.cc,
src/tgbatest/readsave.cc, src/tgbatest/reductgba.cc,
src/tgbatest/tgbaread.cc, src/tgbatest/tripprod.cc,
iface/gspn/dottyssp.cc, iface/gspn/ltlgspn.cc: Adjust calls
to format_tgba_parse_errors.
0efca0f644