[PATCH] D52811: [COFF, ARM64] Add _InterlockedAdd intrinsic

[Eli Friedman via Phabricator via cfe-commits]

efriedma added a comment.

> How come this hasn't been an issue for those targets up until now?

MSVC doesn't define _InterlockedAdd for x64.


Repository:
  rC Clang

https://reviews.llvm.org/D52811