[Bug libstdc++/90220] std::any_cast misbehaves for function and array types

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90220

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Patch for the second bit posted:
https://gcc.gnu.org/ml/gcc-patches/2019-04/msg00927.html