Remove import_resolutions

It's cheaper to re-query this info anyway

crates/ra_analysis/src/descriptors/module/nameres.rs

@@ -32,7 +32,6 @@ pub(crate) struct ItemMap {
 #[derive(Debug, Default, PartialEq, Eq, Clone)]
 pub(crate) struct ModuleScope {
     pub(crate) items: FxHashMap<SmolStr, Resolution>,
-    pub(crate) import_resolutions: FxHashMap<LocalSyntaxPtr, DefId>,
 }
 
 /// A set of items and imports declared inside a module, without relation to
@@ -382,10 +381,6 @@ fn resolve_import(&mut self, module_id: ModuleId, import: &Path) {
                 },
             };
 
-            self.update(module_id, |items| {
-                items.import_resolutions.insert(*ptr, def_id);
-            });
-
             if !is_last {
                 curr = match self.db.id_maps().def_loc(def_id) {
                     DefLoc::Module { id, .. } => id,