[issue45056] compiler: Unnecessary None in co_consts

[Inada Naoki]

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

@Pablo This issue seems an optimization rather than bugfix.
But since Python 3.10 produces more unused constants than 3.9, this is a regression.

GH-28109 removes not all unused constants, but only trailing unused constants.
I think it is enough to fix the regression.

I want to backport it to 3.10 or 3.10.1 after Mark's review.

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nosy: +pablogsal
versions: +Python 3.11

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