[Bug c++/118074] [coroutine] Possible over optimization of co_return

[newsigma at 163 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118074

--- Comment #3 from Weibo He <newsigma at 163 dot com> ---
Intert a printf into final_suspend helps clang and GCC 10 ~ 14 give expected
result. While GCC trunk not work.

https://godbolt.org/z/rEhevKa8h

Output(MSVC, clang, GCC 10 ~ 14):
    final_suspend
    A(A&&) 5
    5

Output(GCC trunk):
    A(A&&) 0
    final_suspend
    0

Is it a GCC 15 regression?