[Bug c++/80682] __is_trivially_constructible(void, int) returns true.

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80682

--- Comment #5 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
This patch doesn't fully provide the means for a library implementation to just
call the intrinsic from the library trait. I have
a patch that does, which I'm testing.