[clang] [clang-format] TableGen keywords support. (PR #77477)

[Hirofumi Nakamura via cfe-commits]

hnakamura5 wrote:

@HazardyKnusperkeks 
Thank you for reviewing!
I do not have write permission to the repository.  Could you please commit this or tell me what I can do?
 

https://github.com/llvm/llvm-project/pull/77477