[issue32623] Resize dict on del/pop

[INADA Naoki]

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

For insert/pop loop, reduce table size aggressively on pop may cause
performance regression.  So reducing size should be conservative.

So my opinion is:

* When dict size become 0, make the dict shared-empty, like dict.clear()
* When (dict size < dk_size/8), call insertion_resize()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32623>
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