[Bug sanitizer/126307] [16 only] backport 8723fe5606de6dfb344afacd667c20f55bb2f5e0 from llvm for fix of tsan fiber destruction

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126307

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'll note you have 10 days left to do this backport to hit 16.2.