[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 [f175030](https://github.com/llvm/llvm-project/commit/f1750300aad0e49383cd4b206e2354f1300a40a8)?
> 
> It seems several of the listed failing bots did:
> 
> * [f175030](https://github.com/llvm/llvm-project/commit/f1750300aad0e49383cd4b206e2354f1300a40a8)
>   
>   * https://lab.llvm.org/buildbot/#/builders/144/builds/23924
>   * https://lab.llvm.org/buildbot/#/builders/3/builds/15227
>   * https://lab.llvm.org/buildbot/#/builders/140/builds/22219
>   * https://lab.llvm.org/buildbot/#/builders/174/builds/17000
>   * https://lab.llvm.org/buildbot/#/builders/190/builds/19234
>   * https://lab.llvm.org/buildbot/#/builders/199/builds/3078
> * [b8bb1cc](https://github.com/llvm/llvm-project/commit/b8bb1ccb4f9126d1bc9817be24e17f186a75a08b)
>   
>   * https://lab.llvm.org/buildbot/#/builders/144/builds/23925
>   * https://lab.llvm.org/buildbot/#/builders/3/builds/15228
>   * https://lab.llvm.org/buildbot/#/builders/140/builds/22220
>   * https://lab.llvm.org/buildbot/#/builders/174/builds/17001
>   * https://lab.llvm.org/buildbot/#/builders/190/builds/19235
>   * https://lab.llvm.org/buildbot/#/builders/199/builds/3079

Similar to the failure you reported in https://github.com/llvm/llvm-project/pull/134196#issuecomment-2839639724,
they were caused by db2315afa8db1153e3b85d452cd14d5a1b957350 instead.

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