[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[Robert Collins]

Robert Collins added the comment:

One thing I noticed while working on this, traceback today stats each included file once per frame per call into e.g. format_list. This might actually account for quite some of the overhead. I'll include an optimisation for this in my new API. http://paste.openstack.org/show/158714/
http://paste.openstack.org/show/158715/

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