gh-151321: Fix incorrect opcode metadata flags for LOAD_DEREF and LOAD_CLOSURE opcodes

[coroma01]

This fix will need backporting to versions:
3.15, 3.14, 3.13, 3.12, Main

• Issue: LOAD_DEREF and LOAD_CLOSURE have incorrect opcode metadata flags #151321

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[python-cla-bot]

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[coroma01]

I don't think this change requires a news entry.

[StanFromIreland]

Can you please summarise why/how this is different from the previous PR for this issue: https://github.com/python/cpython/pull/151386/changes

[markshannon]

Can you please summarise why/how this is different from the previous PR for this issue: https://github.com/python/cpython/pull/151386/changes

#151386 erroneously marks LOAD_CLOSURE with the HAS_FREE_FLAG, but LOAD_CLOSURE is just a synonym for LOAD_FAST. It doesn't access the free variable, only the cell containing it.

This PR only changes the flags for LOAD_DEREF

[StanFromIreland]

Great, thanks Mark. I've closed the other one in favour of this one.