add AR to acronyms of clang-tidy property check
add AR to acronyms of clang-tidy property check

Reviewers: hokein, benhamilton

Reviewed By: benhamilton

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D46895

git-svn-id: a34e9779ed74578ad5922b3306b3d80a0c825546@332382 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra