<flat_map>: Fix new libcxx test failure due to argument type mismatch when calling ranges::remove_if from flat_map::erase_if - #6017

<flat_map>: Fix new libcxx test failure due to argument type mismatch when calling ranges::remove_if from flat_map::erase_if#6017

Stephan T. Lavavej (StephanTLavavej) merged 5 commits into

microsoft:feature/flat_mapmicrosoft/STL:feature/flat_mapfrom

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