[clang][NFC] Annotate Sema/DelayedDiagnostic.h with preferred_type

This helps debuggers to display values in bit-fields in a more helpful way.

Author: Endilll

clang/include/clang/Sema/DelayedDiagnostic.h

@@ -111,7 +111,9 @@ class AccessedEntity {
   }
 
 private:
+  LLVM_PREFERRED_TYPE(AccessSpecifier)
   unsigned Access : 2;
+  LLVM_PREFERRED_TYPE(bool)
   unsigned IsMember : 1;
   NamedDecl *Target;
   CXXRecordDecl *NamingClass;