[llvm] [X86] Add support for indirect branch tracking in jump tables (PR #77679)

[Fangrui Song via llvm-commits]

https://github.com/MaskRay requested changes to this pull request.

I think this needs more discussions. Request change so that this does not land before the discussion concludes. An extra option needs coordination with GCC.

https://github.com/llvm/llvm-project/issues/54247
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104816

https://github.com/llvm/llvm-project/pull/77679