[libcxx-commits] [libcxx] [libc++] Create a `constexpr` hash to use during constant evaluation (PR #214946)

[A. Jiang via libcxx-commits]

================

----------------
frederick-vs-ja wrote:

Don't include these in test files if we don't want to specifically test the internal details of libc++.
```suggestion
```

https://github.com/llvm/llvm-project/pull/214946