Bytecodes cleanup: promote TIER_{ONE,TWO}_ONLY to properties

[gvanrossum]

Instead of

op(FOO, (left, right -- res)) {
    TIER_TWO_ONLY
    <actual code>
}

I'd like to be able to write

tier2 op(FOO, (left, right -- res)) {
    <actual code>
}

Linked PRs

• gh-115778: Add a tierN annotation for instruction definition #115815

[gvanrossum]

If someone wants to pick this up I'm happy to provide some clues as to where to make changes (but multi-file grep goes a long way. :-)

[Eclips4]

I would like to pick this up if you don't mind :)

[gvanrossum]

@Eclips4 Go for it! Remember to run make regen-cases frequently (after each change to the generator and each change to bytecodes.c or the redundancy eliminator input file).

[gvanrossum]

For the CI failures, see gh-115859. Once that's fixed, please merge the latest main and push again.