[issue8299] Improve GIL in 2.7

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Antoine (2):  The need to have do_yield is a symptom of the brokenness
> of the GIL.

Of course it is. But the point of the benchmark is to give valid results
even with the old broken GIL.

I could remove do_yield and still have it give valid results, but that
would mean running each step for 30 seconds instead of 2. I don't like
having to wait several minutes for benchmark numbers :-)

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