Reland "[flang][clang] Add Visibility specific help text for options (#81869)"

This reverts commit 67d20412b448533c77f54ac7a1e5d0775d273729.

This includes fixes for clanginstallapi.

GitOrigin-RevId: aff197ff2163a4b7732d08b833906cc21f4a5c89
1 file changed