[llvm] [NFC] Run clang-format on TGLexer and TGParser (PR #151509)

[Nemanja Ivanovic via llvm-commits]

https://github.com/nemanjai approved this pull request.

This LGTM...

The TLDR version:
I am personally in favour of doing this since it demonstrably can cause unrelated formatting changes in the immediate vicinity of changed code when running `git-clang-format` on the diff. However, I know that there are those in the community that prefer to only run `clang-format` locally when modifying code (i.e. to produce the aforementioned unrelated formatting changes). As the code owner of this part of the llvm project, it is ultimately up to you which approach you prefer for TableGen, but I certainly approve.

https://github.com/llvm/llvm-project/pull/151509