Update weakref_ops.py

Author: BobTheBuidler

mypyc/primitives/weakref_ops.py

@@ -1,17 +1,19 @@
 from mypyc.ir.ops import ERR_MAGIC
 from mypyc.ir.rtypes import object_rprimitive
-from mypyc.primitives.registry import custom_op
+from mypyc.primitives.registry import function_op
 
 # Weakref operations
 
-new_ref_op = custom_op(
+new_ref_op = function_op(
+    name="weakref.ReferenceType",
     arg_types=[object_rprimitive, object_rprimitive],
     return_type=object_rprimitive,
     c_function_name="PyWeakref_NewRef",
     error_kind=ERR_MAGIC,
 )
 
-new_proxy_op = custom_op(
+new_proxy_op = function_op(
+    name="weakref.proxy",
     arg_types=[object_rprimitive, object_rprimitive],
     return_type=object_rprimitive,
     c_function_name="PyWeakref_NewProxy",