[Easy] Use prepend arg to register forward hooks in quantize.py (pyto…

…rch#89391)

Differential Revision: [D41431110](https://our.internmc.facebook.com/intern/diff/D41431110)
Pull Request resolved: pytorch#89391
Approved by: https://github.com/awgu

torch/ao/quantization/quantize.py

@@ -143,11 +143,13 @@ def register_activation_post_process_hook(module, pre_hook=False):
     assert hasattr(module, 'activation_post_process'), \
         'Expect activation_post_process attribute already attached to the module'
     if pre_hook:
-        handle = module.register_forward_pre_hook(_observer_forward_pre_hook)
-        module._forward_pre_hooks.move_to_end(handle.id, last=False)
+        handle = module.register_forward_pre_hook(
+            _observer_forward_pre_hook, prepend=True
+        )
     else:
-        handle = module.register_forward_hook(_observer_forward_hook)
-        module._forward_hooks.move_to_end(handle.id, last=False)
+        handle = module.register_forward_hook(
+            _observer_forward_hook, prepend=True
+        )
 
 
 def add_observer_(module, qconfig_propagation_list=None, non_leaf_module_list=None, device=None, custom_module_class_mapping=None):