https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86627
--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> --- Yeah, looks like a change that was done on gcc-7 trunk and got backported, appearing in 6.3 and 5.5.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86627
--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> --- Yeah, looks like a change that was done on gcc-7 trunk and got backported, appearing in 6.3 and 5.5.