[X86] Remove GetCpuIDAndInfo, GetCpuIDAndInfoEx and DetectFamilyModel functions from X86 MC layer. They haven't been used since CPU autodetection was removed from X86Subtarget.cpp.

llvm-svn: 233170
GitOrigin-RevId: f2071f2672060b836de0870380a5ef7142bd349a
2 files changed