generate_packets.py: make Variant.get_delta_send_body() take a before_return parameter
Part of #44577. Add a parameter to Variant.get_delta_send_body() for code that needs to be added before any return, so that Variant.get_send() can pass in the pre2 value.
alienvalkyrie
Part of #44577. Add a parameter to Variant.get_delta_send_body() for code that needs to be added before any return, so that Variant.get_send() can pass in the pre2 value.