[issue2534] Restore isinstance and issubclass speed in 2.6

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

speedup of this patch confirmed.  Also, it triggers the bugs mentioned
that have their own issues open.  Once #2542 is fixed this should be
looked at again.

Its a big performance regression in 2.6 over 2.5 if we don't get this
in, marking it critical.

----------
dependencies: +PyErr_ExceptionMatches must not fail
nosy: +gregory.p.smith
priority:  -> critical
title: Speed up isinstance and issubclass -> Restore isinstance and issubclass speed in 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2534>
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