Fix computed size of WideInstruction #32
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According to https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-6.html#jvms-6.5.wide when the wide instruction holds an
IINCthen it have size of 6. Otherwise it has a size of 4.This bug caused a cafedude to crash when writing a class that uses wide instruction.
Also added a sample class to the tests.