[llvm] [MC, X86] emitInstruction: remove virtual function calls due to Intel JCC Erratum (PR #96835)

[Shengchen Kan via llvm-commits]

https://github.com/KanRobert approved this pull request.

LGTM, could you add  x86_64-pc-win32 for ./llvm/test/MC/X86/align-branch-single.s

https://github.com/llvm/llvm-project/pull/96835