[clang] [clang-format][NFC] Clean up the driver and getStyle() in Format.cpp (PR #74794)

[Ben Hamilton via cfe-commits]

bhamiltoncx wrote:

Seems like this regressed `clang-format - -dump_config < path/to/objc_file.m`. I filed https://github.com/llvm/llvm-project/issues/79023.


https://github.com/llvm/llvm-project/pull/74794