[Bug tree-optimization/109543] Avoid using BLKmode for unions with a non-BLKmode member when possible

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109543

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, guess we still have target code doing ABI decisions based on mode ...