Add enum variant string information to definition

New enum variant status now appears in the string representation of
the resolver's definition.

gcc/rust/ChangeLog:

	* resolve/rust-rib.cc (Rib::Definition::to_string): Add enum variant
	status.

Signed-off-by: Pierre-Emmanuel Patry <[email protected]>

Author: P-E-P

gcc/rust/resolve/rust-rib.cc

@@ -76,6 +76,8 @@ Rib::Definition::to_string () const
 	}
     }
   out << "]";
+  if (enum_variant)
+    out << "(enum variant)";
   return out.str ();
 }