[llvm] [Support] Fix llvm::xxh3_128bits for win 32 builds (PR #96891)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Can you edit the first comment (will be used as the commit message) to say that `__emulu` needs <intrin.h>`?

https://github.com/llvm/llvm-project/pull/96891