[issue45711] Simplify the interpreter's (type, val, tb) exception representation

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

I can probably just put back the two fields in _PyErr_StackItem and make sure they get updated when exc_value is set. 

Reverting the whole thing would include big changes in compile.c and ceval.c, so I'd rather avoid that if we can.

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<https://bugs.python.org/issue45711>
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