[clang] [clang][bytecode] Refactor Check* functions (PR #152300)

[Timm Baeder via cfe-commits]

tbaederr wrote:

https://llvm-compile-time-tracker.com/compare.php?from=3fa2f60d77aba3a50cf25ff02cb73ead2ab0588e&to=1e53920ba4726d3ec72c87be5dd32c293d77d234&stat=instructions:u

https://github.com/llvm/llvm-project/pull/152300