[issue31377] remove *_INTERNED opcodes from marshal

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

I doubt that interning cause reproduciblity problem.

AFAIK, all strings in code object are interned or not
interned deterministically.

https://bugzilla.opensuse.org/show_bug.cgi?id=1049186
This issue seems be caused by w_ref() based on object refcnt,
not interning.

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<https://bugs.python.org/issue31377>
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