[Bug target/79671] [7 Regression] mapnik miscompilation on armv7hl since r235622

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671

--- Comment #99 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to rguenther@suse.de from comment #95)
> >
> >this would fix the remaining fall-out.
> 
> Because that is not how it was designed or documented to work :)

So yes, it seems I misunderstood what may_alias should do.

It is defined on the type, however it has only meaning on the
pointers to that type, but not on the instances.

But I wanted to have an attribute to express in the tree
that instances and pointers to that type may alias anything.

How about adding a new type attribute, that does what I meant,
like always_alias for instance?