[issue28123] _PyDict_GetItem_KnownHash ignores DKIX_ERROR return

[STINNER Victor]

STINNER Victor added the comment:

Xiang Zhang added the comment:
> How about let PyDict_GetItem call it?

PyDict_GetItem() is like the most important function in term of
performance for Python. If you want to touch it, you must benchmark
it.

I would prefer to keep it as it is.

> Just like the relationship of delitem and delitem_knownhash.

delitem is less important in term of performance, so I decided to
accept Naoki's change to merge duplicated code.

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