OP_REVERSEBYTES activation logic
Summary: Depends on D4871. Based on D3736.
Test Plan:
ninja check
test/functional/test_runner.py
test/functional/test_runner.py --with-phononactivation
Reviewers: deadalnix, markblundeberg, O1 Bitcoin ABC, #bitcoin_abc
Reviewed By: deadalnix, O1 Bitcoin ABC, #bitcoin_abc
Maniphest Tasks: T707
Differential Revision: https://reviews.bitcoinabc.org/D5130