[Bug libstdc++/100466] compilation of assignment from initialization list to std::array with non-trivial constructor of T is very slow

[xry111 at mengyan1223 dot wang via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100466

--- Comment #1 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
clang-12 handles this correctly.