Mark de Wever 7f5d130a42 [libc++][chrono] Add hh_mm_ss formatter.
Partially implements:
- P1361 Integration of chrono with text formatting
- P2372 Fixing locale handling in chrono formatters
- P1466 Miscellaneous minor fixes for chrono

Depends on D137022

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D139771
2023-02-14 19:12:19 +01:00
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