[clang] [clang] Separate Intel ADC instrinsics from ADX intrinsics (PR #75992)

[Paul T Robinson via cfe-commits]

pogo59 wrote:

Thanks for adding the guard to the include adxintrin.h, now that it has only the ADX stuff it is the right way to go. As PS4 code owner I approve!

https://github.com/llvm/llvm-project/pull/75992