[clang] [clang-format][NFC] Make LangOpts global in namespace Format (PR #81390)

[Lei Huang via cfe-commits]

lei137 wrote:

@owenca This PR broke the following PowerPC bots:
* https://lab.llvm.org/buildbot/#/builders/230
* https://lab.llvm.org/buildbot/#/builders/121
But the rhel both https://lab.llvm.org/buildbot/#/builders/57 is fine.  

AFAIK the only difference between these bots is that builder 57 is RHEL and 230/121 is Ubuntu.  
Please let us know if you are able to provide a quick fix. If not, please revert.

https://github.com/llvm/llvm-project/pull/81390