[Bug c++/90243] diagnostic notes that belong to a suppressed error about an uninitialized variable in a constexpr function are still shown

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90243

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is still present on gcc-8-branch and gcc-9-branch.