[libcxx-commits] [libcxx] [libc++][hardening] Add a bounds check for `valarray` and `bitset`. (PR #120685)

[Louis Dionne via libcxx-commits]

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

Some comments. Thanks for adding those!

LGTM with the comments addressed.

https://github.com/llvm/llvm-project/pull/120685