rust-dirstatemap: stop using `.state` in `is_from_other_parent`

This is a deprecated API and will be removed one day.

Differential Revision: https://phab.mercurial-scm.org/D12537

rust/hg-core/src/dirstate/entry.rs

@@ -655,8 +655,7 b' impl DirstateEntry {'
     }
 
     pub(crate) fn is_from_other_parent(&self) -> bool {
-        self.state() == EntryState::Normal
-            && self.size() == SIZE_FROM_OTHER_PARENT
+        self.flags.contains(Flags::WDIR_TRACKED | Flags::P2_INFO)
     }
 
     // TODO: other platforms