[Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r224161 aka debug-early branch merge.