Adopt LWG-3541 indirectly_readable_traits should be SFINAE-friendly for all types - #1992

Adopt LWG-3541 indirectly_readable_traits should be SFINAE-friendly for all types#1992

Stephan T. Lavavej (StephanTLavavej) merged 3 commits into

microsoft:mainmicrosoft/STL:mainfrom

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