Issue #15110: Also hide importlib frames when importing a builtin module fails.

Lib/importlib/_bootstrap.py

@@ -490,12 +490,16 @@ def load_module(cls, fullname):
         """Load a built-in module."""
         is_reload = fullname in sys.modules
         try:
-            return _imp.init_builtin(fullname)
+            return cls._exec_module(fullname)
         except:
             if not is_reload and fullname in sys.modules:
                 del sys.modules[fullname]
             raise
 
+    @classmethod
+    def _exec_module(cls, fullname):
+        return _imp.init_builtin(fullname)
+
     @classmethod
     @_requires_builtin
     def get_code(cls, fullname):