[Bug lto/85248] [6/7/8 Regression] Miscompilation when using error function that returns

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85248

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think we want to merge the cgraph nodes but _not_ merge decls (thus not
call lto_symtab_prevail_decl).  Iff that is supported somehow...?  Probably
we expect the decl <-> cgraph node be a 1:1 relation, not a n:1 one.

I think the issue you run into can happen generally, no?  Or we indeed do
not reclaim the mpx stuff properly.

Anyhow, I guess you need to debug the specific ICE further or reduce the scope
of "flags" you bail out for now to that of the error() case (noreturn).