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

[jakub at gcc dot gnu.org]

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

--- Comment #56 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I think may_alias attribute only affects pointers/references (pointer/reference
to may_alias type is considered to reference any type), but in this->functor =
f.functor the only pointer is this and *this likely isn't may_alias, and the
bug is about f.functor access anyway.