Fix the `_Choose_pocca_v` branch in `basic_string::operator=(const&)`#4031

Merged

StephanTLavavej merged 12 commits intomicrosoft:mainfrom achabense:_String_copy_assign

Sep 21, 2023

+186-19

Commits on Sep 20, 2023

Restrict the MSVC workaround to C++20 compile-time.
StephanTLavavej
committed