Revert "[inductor] Load python modules using importlib (#126454)"

This reverts commit faa26df.

Reverted #126454 on behalf of https://github.com/DanilBaibak due to Break internal build ([comment](#126454 (comment)))

torch/_inductor/runtime/compile_tasks.py

@@ -1,10 +1,10 @@
 from __future__ import annotations
 
 import functools
-import importlib
 import os
 import sys
 import warnings
+from types import ModuleType
 from typing import Any, Callable
 
 
@@ -31,20 +31,19 @@ def _reload_python_module_in_subproc(key, path):
 
 
 def _reload_python_module(key, path):
-    spec = importlib.util.spec_from_file_location(f"{__name__}.{key}", path)
-    if spec is None or spec.loader is None:
-        raise RuntimeError(f"Failed to import {path}: path not found")
-    module = importlib.util.module_from_spec(spec)
-    module.key = key  # type: ignore[attr-defined]
-    try:
-        spec.loader.exec_module(module)
-    except Exception as e:
-        raise RuntimeError(
-            f"Failed to import {path}\n{type(e).__name__}: {e}"
-        ) from None
-
-    sys.modules[module.__name__] = module
-    return module
+    with open(path) as f:
+        try:
+            code = compile(f.read(), path, "exec")
+        except Exception as e:
+            raise RuntimeError(
+                f"Failed to import {path}\n{type(e).__name__}: {e}"
+            ) from None
+        mod = ModuleType(f"{__name__}.{key}")
+        mod.__file__ = path
+        mod.key = key  # type: ignore[attr-defined]
+        exec(code, mod.__dict__, mod.__dict__)
+        sys.modules[mod.__name__] = mod
+        return mod
 
 
 @functools.lru_cache(None)