[issue23573] Avoid redundant allocations in str.find and like

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Many thanks Victor for fixing crashes. Unfortunately I couldn't reproduce a 
crash on my computers, perhaps it is was 64-bit only.

Yes, I'll look how the code can be optimized.

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<http://bugs.python.org/issue23573>
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