ByteCode doesn't handle EXTENDED_ARG

Issue #373 duplicate
Gregory P. Smith created an issue

bytecode.py's ByteCode class does not handle the EXTENDED_ARG opcode. When attempting to do a coverage run on code large enough to need to use it that (jumping to a location greater than 16 bits away) it fails miserably.

I don't have an example file to attach, but I believe one could be constructed for the purposes of the needed unittest for this case.

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