[llvm] [X86] Switch to the new symbol visibility macros (PR #109982)

[Saleem Abdulrasool via llvm-commits]

https://github.com/compnerd commented:

This is a pretty straightforward change, the attribute being applied here are just behind a different macro and are part of the LLVM-C library.

https://github.com/llvm/llvm-project/pull/109982