gh-109256: allocate opcode IDs for internal opcodes in their own range

[iritkatriel]

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📚 Documentation preview 📚: https://cpython-previews--109269.org.readthedocs.build/

• Issue: Changes to specialized instructions requires a magic number change. #109256

[markshannon]

Looks good, in general.

test_dis will need fixing up, of course.

As you need to fix test_dis anyway could you make RESUME opcode 1? If it is to have a special number, it might as well be memorable.

    map_op(1, "RESUME")
    next_opcode = 2

[iritkatriel]

Looks good, in general.

test_dis will need fixing up, of course.

As you need to fix test_dis anyway could you make RESUME opcode 1? If it is to have a special number, it might as well be memorable.

    map_op(1, "RESUME")
    next_opcode = 2

RESUME has an arg though, so I thought it should be after HAVE_ARGUMENT? Unless we want to special case it.

[markshannon]

Looks good. Should save a fair bit of future churn.
Merge conflicts need fixing, obviously.