[clang] [llvm] [C2y] Support WG14 N3457, the __COUNTER__ macro (PR #162662)

[Aaron Ballman via llvm-commits]

AaronBallman wrote:

Oh! That's in a different repository! This should hopefully be fixed now by https://github.com/llvm/llvm-test-suite/commit/b339aa8d90432a7f0875aaf9530435a534a46ff6

https://github.com/llvm/llvm-project/pull/162662