[libc-commits] [libc] [libc] raise CMAKE_CXX_STANDARD to C++20 (PR #87020)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

@gchatelet should I be upgrading benchmarks, too?

https://github.com/llvm/llvm-project/blob/bbbcc1d99d08855069f4501c896c43a6d4d7b598/libc/benchmarks/CMakeLists.txt#L74

https://github.com/llvm/llvm-project/pull/87020