[clang][NFC] Annotate `DependentDiagnostic.h with preferred_type

Author: Endilll

clang/include/clang/AST/DependentDiagnostic.h

@@ -113,7 +113,9 @@ class DependentDiagnostic {
 
   struct {
     SourceLocation Loc;
+    LLVM_PREFERRED_TYPE(AccessSpecifier)
     unsigned Access : 2;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned IsMember : 1;
     NamedDecl *TargetDecl;
     CXXRecordDecl *NamingClass;