Improve usage of file_id

src/parser.hpp

@@ -731,8 +731,12 @@ struct Ast {
 	
 	// NOTE(bill): I know I dislike methods but this is hopefully a temporary thing 
 	// for refactoring purposes
-	AstFile *file() const {
-		return get_ast_file_from_id(this->file_id);
+	gb_inline AstFile *file() const {
+		// NOTE(bill): This doesn't need to call get_ast_file_from_id which 
+		return global_files[this->file_id];
+	}
+	gb_inline AstFile *thread_safe_file() const {
+		return thread_safe_get_ast_file_from_id(this->file_id);
 	}
 };