[llvm] [TableGen] Add explicit symbol visibility macros to code generated (PR #107873)

[Vassil Vassilev via llvm-commits]

vgvassilev wrote:

> LGTM

@kparzysz, could you merge this as iiuc @fsfod does not have commit access.

@fsfod, you will be doing a lot of these PRs, could you ask for commit access?

https://github.com/llvm/llvm-project/pull/107873