[libcxx-commits] [libcxx] [libcxx] cbegin should always return a constant iterator (PR #99915)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

@strega-nil @ldionne I pushed small changes to resolve CI failures. Please double check that there are no undesired changes.

https://github.com/llvm/llvm-project/pull/99915