[clang] [BitInt] Expose a _BitInt literal suffix in C++ (PR #86586)

[Erich Keane via cfe-commits]

erichkeane wrote:

At least the windows failure seems completely unrelated, it is a 'flang' build failure, likely caused by you getting 'unlucky' and the build being broken at the time.  You DO have a conflict to resolve, so perhaps doing that will get you back to green.

https://github.com/llvm/llvm-project/pull/86586