code objects remove unknown opcodes from the instruction stream when accessing co_code

[DinoV]

Bug report

Bug description:

If you construct a code object with an unknown opcode it'll get removed when the code object goes through the opcodes to de-opt them. We should just ignore unknown opcodes instead.

CPython versions tested on:

3.12, 3.14

Operating systems tested on:

Linux

Linked PRs

• gh-128045: Mark unknown opcodes as deopting to themselves #128044

[markshannon]

Constructing a code object with an unknown opcode seems like a bug to me.

I presume this is for Cinder.
Is there a way to make this work for Cinder, without making CPython less resilient?