<xmemory>: Unify overloads of _Allocate and _Deallocate with if constexpr - #4432

<xmemory>: Unify overloads of _Allocate and _Deallocate with if constexpr#4432

Stephan T. Lavavej (StephanTLavavej) merged 7 commits into

microsoft:mainmicrosoft/STL:mainfrom

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