[llvm] [NFC][X86] Clang-format X86DisassemblerDecoderCommon.h (PR #73272)

[David Blaikie via llvm-commits]

dwblaikie wrote:

Once a pull request has been created, please don't commit it until it's been approved (we don't want to muddy the waters between code that was judged to require precommit review, and code that wasn't - if a review is created, that communicates the intent that the code needs precommit review, and so committing it without that review is a mistake/missing that required review)

https://github.com/llvm/llvm-project/pull/73272