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

[Owen Pan via cfe-commits]

owenca 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 f1750300aad0e49383cd4b206e2354f1300a40a8?

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