[IronPython] Fix for 29928

[haniti grk]

Hi All,

I tried to apply the fix as suggested by Dino for 29928. I have submitted a
pull request, kindly review.

Per my test, it took less than 1 sec (0.01 sec) for a 40 Or expression.
Prior to the changes, 3 hours is not enough to complete the statement on a
reasonably fast machine.

#Haniti#
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