[issue30014] Speedup DefaultSelectors.modify() by 2x

[STINNER Victor]

STINNER Victor added the comment:

@Giampaolo Rodola: CPython development moved to GitHub, can you please create a pull request instead of a patch? Thank you.
https://docs.python.org/devguide/pullrequest.html

Hum, I see that my old patch of issue #18932 (selectors_optimize_modify-2.patch) is different. I tried to factorize code. What do you think of my change?

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<http://bugs.python.org/issue30014>
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