⚡️ Speed up method CfoVisitor._get_called_func_name by 18% in PR #501 (runtime-fixes-2)

**Key optimizations:**
- Avoid multiple `isinstance` calls by caching `type(node)` in a variable and using identity checks against the expected types (`_ast_Name`, `_ast_Attribute`).
- This speeds up the type checks, since identity comparison is faster than repeated isinstance checks, and in this hot path, there are only two accepted types.

Author: codeflash-ai[bot]

codeflash/code_utils/edit_generated_tests.py

@@ -62,11 +62,12 @@ def visit_Call(self, node):  # type: ignore[no-untyped-def] # noqa: ANN201, ANN0
             self.results.append(node.lineno - 1)
         self.generic_visit(node)
 
-    def _get_called_func_name(self, node):  # type: ignore[no-untyped-def] # noqa: ANN001, ANN202
+    def _get_called_func_name(self, node):
         """Return name of called fn."""
-        if isinstance(node, ast.Name):
+        t = type(node)
+        if t is _ast_Name:
             return node.id
-        if isinstance(node, ast.Attribute):
+        if t is _ast_Attribute:
             return node.attr
         return None
 
@@ -272,3 +273,8 @@ def add_runtime_comments_to_generated_tests(
             modified_tests.append(test)
 
     return GeneratedTestsList(generated_tests=modified_tests)
+
+
+_ast_Name = ast.Name
+
+_ast_Attribute = ast.Attribute