[llvm] [Support/rpmalloc] Updated fake atomics with Interlocked functions (PR #148303)

[Alexandre Ganea via llvm-commits]

aganea wrote:

> > We do require VS 2019 version 16.8 minimally in LLVM, please see [28bba0d](https://github.com/llvm/llvm-project/commit/28bba0d717a43ea3f01689625577197889374965)
> > However that is not enough afaik for C11 stdatomics, it needs VS 2022 version 17.5 minimally: https://devblogs.microsoft.com/cppblog/c11-atomics-in-visual-studio-2022-version-17-5-preview-2/
> 
> Nice point.
> 
> > One other option would be to integrate into LLVM from [develop](https://github.com/mjansson/rpmalloc/tree/develop) at head (if you think that should be stable enough).
> 
> But the develop branch of rpmalloc uses only stdatomic since 2023. So we cannot use any new release or dev branch as is until LLVM will require VS 2022.

I see. Sounds good then, thanks for coping with me!

https://github.com/llvm/llvm-project/pull/148303