[clang][NFC] Improve locality of recently refactored enums (#70943)
This patch moves definition of recently refactored enums closer to the
types where they were originally defined. Since they are scoped enums at
namespace scope now, they can be forward-declared.
Refactorings in question are:
aaba3761db84032541712899964714f3184e8b3d
50dec541f328a251c2830421f354e4439e635def
b120fe8d3288c4dca1b5427ca34839ce8833f71c
ae7b20b583fab1325d8b51fe5f2eaf612de8b95e
4ad2ada5216ee2bb3c334a3233a9ab51f2521b82
49fd28d9601dde429436655ec74234e895c60b89
llvm
24228aef - [clang][NFC] Improve locality of recently refactored enums (#70943)
