[Bug sanitizer/70342] g++ -fsanitize=undefined never finishes compiling (>24h) in qtxmlpatterns test suite

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70342

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And doesn't look like a regression; GCC 5 has the same problem.