[issue2506] Add mechanism to disable optimizations

[Ned Batchelder]

Ned Batchelder <ned at nedbatchelder.com> added the comment:

If there is any doubt that this affects people, it was reported *again* against coverage.py today: https://github.com/nedbat/coveragepy/issues/1025

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue2506>
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