Auto merge of #14632 - Veykril:lru-macro, r=lnicola

internal: Increase LRU cache size for parse_expansion and macro_expand queries

crates/hir-expand/src/ast_id_map.rs

@@ -115,6 +115,7 @@ impl AstIdMap {
                 }
             }
         }
+        res.arena.shrink_to_fit();
         res
     }