[clang] [clang-format] Support of TableGen statements in unwrapped line parser (PR #78846)

[Hirofumi Nakamura via cfe-commits]

hnakamura5 wrote:

Thank you very much!

> how small the diff is

Maybe it is by TableGen's simple syntax, and that here we are parsing only the structure of the statements. (e.g. ignoring the `<cond>` part of `if` now).

https://github.com/llvm/llvm-project/pull/78846