Cleanups and enhancements for `basic_string` - #3984

Merged

Stephan T. Lavavej (StephanTLavavej) merged 6 commits into

microsoft:mainfrom

achabense:_StringCleanups

Sep 21, 2023

Commits on Aug 22, 2023

merge `_Memcpy_val_from`
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acd0821
simplify construction from initializer_list
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f7e8135
improve exception guarantee
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6ed3396
improve usage of `_Calculate_growth`
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3cda46d
noexcept enhancements
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14b7558
nitpick
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a0716eb