remove our patch to importlib

Author: timfel

graalpython/lib-python/3/importlib/_bootstrap.py

@@ -985,22 +985,6 @@ def _find_and_load_unlocked(name, import_):
 
 def _find_and_load(name, import_):
     """Find and load the module."""
-    # (tfel) Truffle change: CPython actually tests if name is in sys.modules
-    # *before* ever calling this function (see the "optimization" in import.c
-    # PyImport_ImportModuleLevelObject). Afaict, this "optimization" is the only
-    # thing that avoids a deadlock situation tested for in
-    # test_threaded_import.py#test_circular_imports.
-    module = sys.modules.get(name, _NEEDS_LOADING)
-    if module is not _NEEDS_LOADING and module is not None:
-        # (tfel): the C code now calls import_ensure_initialized - this reads
-        # the __spec__._initializing field and only calls _lock_unlock_module if
-        # that is true. Note that it uses _PyModuleSpec_IsInitializing to read
-        # __spec__._initializing, which ignores any error while reading either
-        # __spec__ or _initializing.
-        if getattr(getattr(module, "__spec__", None), "_initializing", None):
-            _lock_unlock_module(name)
-        return module
-
     with _ModuleLockManager(name):
         module = sys.modules.get(name, _NEEDS_LOADING)
         if module is _NEEDS_LOADING: