[PATCH] Handle bytes in the range 0x80-0xC0 better when dealing with ISO-IR 196.

[Stephen J. Turnbull]

Aidan Kehoe writes:

 > I agree that it would be better to move potentially-crashing tests
 > into separate files, and extend the test architecture to deal with
 > that sensibly, but that’s a separate issue from this change.

I didn't ask you to extend the test architecture, just to move the
known crash into a separate file.  Please just do that.  Suggestions
on architecture are welcome, but can wait.