<flat_meow>: Don't do extra work in count(), contains(), and equal_range() - #5994

<flat_meow>: Don't do extra work in count(), contains(), and equal_range()#5994

Stephan T. Lavavej (StephanTLavavej) merged 12 commits into

microsoft:feature/flat_mapmicrosoft/STL:feature/flat_mapfrom

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