It's not necessary anymore as all supported Python versions implement
get_instructions, and inlining the usage of that is as readable as
calling _get_opcodes.
Also use the subset/superset predicate for validity testing instead of
difference as it's a fair bit faster:
❯ python3.8 -mtimeit -s 's1 = set(range(10)); s2 = set(range(5))' 's2 - s1'
5000000 loops, best of 5: 88.3 nsec per loop
❯ python3.8 -mtimeit -s 's1 = set(range(10)); s2 = set(range(5, 15))' 's2 - s1'
2000000 loops, best of 5: 159 nsec per loop
❯ python3.8 -mtimeit -s 's1 = set(range(10)); s2 = set(range(5))' 's1 >= s2'
5000000 loops, best of 5: 71.1 nsec per loop
❯ python3.8 -mtimeit -s 's1 = set(range(10)); s2 = set(range(5, 15))' 's1 >= s2'
5000000 loops, best of 5: 53.6 nsec per loop
we're paying double in the failure case but that doesn't super duper matter
because we're raising an exception and bailing out, the 24% gain on the
happy path seems more relevant.
closesodoo/odoo#48948
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>