[libcxx-commits] [libcxx] [libc++] Add a few _LIBCPP_ASSERT_INTERNALs to make sure internal invariants are kept (PR #114575)

[Louis Dionne via libcxx-commits]

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

LGTM with small comments. I like this!

https://github.com/llvm/llvm-project/pull/114575