[clang] [clang-format] Support of TableGen formatting. (PR #76059)

[Owen Pan via cfe-commits]

owenca wrote:

> I avoid this by using clang-format binary from main branch in my local. What should I do with this failure?

You can ignore it if running the in-tree clang-format is clean, e.g.:
```
$ clang/tools/clang-format/git-clang-format --binary build/bin/clang-format HEAD~
clang-format did not modify any files
$ 
```

https://github.com/llvm/llvm-project/pull/76059