[libc-commits] [libc] [libc] add timeout and clock conversion utilities (PR #91905)

[via libc-commits]

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

----------------
lntue wrote:

So I guess you can make `ensure_monotonic` a friend function of `AbsTimeout` class, and change this file name to `ensure_monotonic.h`.

https://github.com/llvm/llvm-project/pull/91905