[Bug bootstrap/85571] [9 Regression] non-bootstrap-debug miscompare with trunk

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85571

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Or more sophisticated allow to override/amend what we compare in the .mk
snippets
and compare $(exeext) instead of ($objext) for bootstrap-lto.