[issue2534] Restore isinstance and issubclass speed in 2.6

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

+1 on applying this patch right away.

For 2.6 and 3.0 to be successful, we need people to prefer to upgrade 
rather than stay with 2.5.  A systemic slowdown in not in the best 
interests of the language moving forward.

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nosy: +rhettinger

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