[issue1394] simple patch, improving unreachable bytecode removing

[Benjamin Peterson]

Benjamin Peterson added the comment:

>Yes, help with unit tests would be appreciated.  Especially since it is
>not supposed to fix anything, so I'm not sure what unit tests should be
>like...
Unit tests are just for bugfixes. They let us make sure Python is doing
what we want it to do in a given case. Your unit test will probably have
functions where you optimization should take effect and assert that it
does. For starters, take a look at Lib/test/test_peephole.py

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nosy: +benjamin.peterson

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