[clang] [clang-format] Add OneLineFormatOffRegex option (PR #137577)

[via cfe-commits]

dyung wrote:

> @dyung I don't see anything in this patch could cause a failure in CodGen tests. Have you verified it e.g. by running the tests on [f175030](https://github.com/llvm/llvm-project/commit/f1750300aad0e49383cd4b206e2354f1300a40a8)?

One of the bots did.
- f1750300aad0e49383cd4b206e2354f1300a40a8 (https://lab.llvm.org/buildbot/#/builders/144/builds/23924): pass
- b8bb1ccb4f9126d1bc9817be24e17f186a75a08b (https://lab.llvm.org/buildbot/#/builders/144/builds/23925): fail

https://github.com/llvm/llvm-project/pull/137577