[Bug c++/125851] Many C++ test failures with -std=c++29 (ICE in get_cxx_dialect_name, at cp/name-lookup.cc:7543) by r17-1595-g0c5c6249a2e9a7

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125851

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Sorry, I thought I've tested with 98,11,14,17,20,23,26,29.
Above change preapproved for trunk.