[issue17611] Move unwinding of stack for "pseudo exceptions" from interpreter to compiler.

[Stefan Krah]

Stefan Krah added the comment:

The change seems to slow down the pi float benchmark. Run this and hit
Ctrl-C after the first decimal result appears:

./python Modules/_decimal/tests/bench.py


I've run the benchmark seven times and the average for float is
something like 8-10% slower (64-bit Linux, Core 2 Duo). Decimal
is not affected.

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nosy: +skrah

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