Mark de Wever 34acc91642 [libc++] Require C++20 to build the benchmarks.
Some work-in-progress patches for the format header contain benchmarks.
The format header requires C++20 to build. This is a preparation to make
it easy to add these benchmarks.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D96057
2021-02-09 18:34:07 +01:00
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