[Bug middle-end/65358] wrong parameter passing code with tail call optimization on arm

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65358

--- Comment #23 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to ktkachov from comment #22)
> (In reply to James Greenhalgh from comment #21)
> > As this has been failing since GCC 4.6.3, it is not a regression and
> > therefore Kyrill's fix would not be appropriate for Stage 4.
> > 
> > It may be that the release managers make an exception for this fix, given
> > that it can cause wrong-code generation on a primary target. Otherwise, I'd
> > expect this to get fixed in 6.0 and backported as appropriate. Richard/Jakub?
> 
> Yeah, I agree it's not a regression on the release branches, but we did have
> wrong-code fixes in stage4 before (like for PR 65235).
> My fix should only ever trigger in the case where we would definitely
> miscompile otherwise, and should not impact codegen in any other case.
> 
> I don't mind waiting till stage 1 and backporting later. Up to the
> maintainers/release managers.

It's fine to fix wrong-code regressions in stage4 if they are obviously safe.