[clang] [clang] Add `intrin0.h` header to mimic `intrin0.h` used by MSVC STL for clang-cl (PR #75711)

[Max Winkler via cfe-commits]

MaxEW707 wrote:

Friendly reminder that I require someone to commit on my behalf since I do not have write access :).

https://github.com/llvm/llvm-project/pull/75711