[clang] [HLSL] Implementation of the elementwise fmod builtin (PR #108849)

[Zhengxing li via cfe-commits]

lizhengxing wrote:

@farzonl Could you help to merge this PR? The 2 failing checks are in libc++ since yesterday. It might be caused by [#107638](https://github.com/llvm/llvm-project/pull/107638). 

@hekota pinged the authors of [#107638](https://github.com/llvm/llvm-project/pull/107638) to see if they think it might be related.




https://github.com/llvm/llvm-project/pull/108849