[clang-tools-extra] [libcxx] [clang-tools-extra]: Check for static in constexpr (PR #175814)

[Baranov Victor via cfe-commits]

vbvictor wrote:

If this is a warning in clang, you can add it in clang-tidy via `clang-diagnostic-*` (or give exactly warning name there). 

If this flag is not in compiler database, you can add it with --extra-arg=-W... or use same option in config


https://github.com/llvm/llvm-project/pull/175814