[Bug c++/85548] Zero-initialization of padding bits of an aggregate class (class A) member of a non-aggregate class (class B) is not performed when B is value-initialized.

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85548

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
__builtin_clear_padding is for libstdc++ to clear padding bits in arbitrary
trivially-copyable objects, it's not useful here because the compiler should be
doing it automatically.