[libcxx-commits] [libcxx] [libc++] Move lerp to its own header instead of <cmath> (PR #213111)

[Louis Dionne via libcxx-commits]

ldionne wrote:

I've moved the function to `__cmath` instead since it's not supposed to be in `math.h`. I think I'd also like to do that for the other math special functions, which would remove the TODO in `modules.py`.

https://github.com/llvm/llvm-project/pull/213111