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get a class writer which will not attempt to load classes. The default classwriter tries this when a
reference type local var frame slot aligns with a slot of reference type in a successor block's
frame. This is merely so it can optimize a slot out of the frame change set in the special case where
f1[slot].type < f2[slot].type or vice versa by using the least common supereclass. We have to use
the Transformer to reuse existing loaded classes and, where a class has not been loaded, to
attempt to load the bytecode as a resource and identify supers via the bytecode.