Revert "eagarly clean astd maps"

This reverts commit 6c63a59425.

This causes massive slowdowns: looks like we accidentally have some source-depndent

crates/ra_hir/src/db.rs

@@ -60,7 +60,7 @@ pub trait DefDatabase: SourceDatabase {
     #[salsa::invoke(crate::source_id::AstIdMap::ast_id_map_query)]
     fn ast_id_map(&self, file_id: HirFileId) -> Arc<AstIdMap>;
 
-    #[salsa::invoke(crate::source_id::AstIdMap::ast_id_to_node_query)]
+    #[salsa::invoke(crate::source_id::AstIdMap::file_item_query)]
     fn ast_id_to_node(&self, file_id: HirFileId, ast_id: ErasedFileAstId) -> TreeArc<SyntaxNode>;
 
     #[salsa::invoke(RawItems::raw_items_query)]

crates/ra_hir/src/source_id.rs

@@ -92,7 +92,7 @@ pub(crate) fn ast_id_map_query(db: &impl DefDatabase, file_id: HirFileId) -> Arc
         Arc::new(AstIdMap::from_source_file(&source_file))
     }
 
-    pub(crate) fn ast_id_to_node_query(
+    pub(crate) fn file_item_query(
         db: &impl DefDatabase,
         file_id: HirFileId,
         ast_id: ErasedFileAstId,

crates/ra_syntax/src/grammar.ron

@@ -674,7 +674,7 @@ Grammar(
         "LifetimeArg": (),
 
         "MacroItems": (
-            traits: [ "ModuleItemOwner", "FnDefOwner" ],
+            traits: [ "ModuleItemOwner", "FnDefOwner" ],            
         ),
 
         "MacroStmts" : (