[Bug c++/66487] [6 Regression] Firefox segfault with LTO enabled

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66487

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Actually, I guess checking for this is more of a fit for an uninitialized read
detector such as MemorySanitizer or Valgrind memcheck.