[Bug libstdc++/87520] [8/9 Regression] ODR violations in std::make_shared when mixing -fno-rtti and -frtti

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87520

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> @@ -513,7 +512,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>        alignas(type_info) static constexpr _Sp_make_shared_tag __tag;

This needs to be fixed to have the right size as well as alignment, so the
reference binds to suitable storage (as per core DR 453).