[Bug libstdc++/124121] Missed optimization in initialization of std::inplace_vector with std::initializer_list

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124121

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yeah, laundering on every access would be absolutely terrible.

vec[0] = 1;
// OPTIMIZATION BARRIER
int i = vec[0];