[libcxx-commits] [libcxx] [libc++] Fix naming of value template parameters (PR #76888)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

I can get behind this if we strive to move the codebase towards `_Np` style arguments. So we can check this in (this patch should use `_Np` style for the non-uglified ones it introduces though), and then we can do another patch to move towards `_Np` everywhere.

LGTM on this patch w/ `_Np` style for the few ones you added.

https://github.com/llvm/llvm-project/pull/76888