[BCEL] Visitor interfaces

[sebb <se...@gmail.com>]

BCEL has two Visitor interfaces, in the packages bcel6.classfile and
bcel6.generic.

This is somewhat confusing, and the Javadoc does not really help to
distinguish them.

Any info on this?

Both of them have an EmptyVisitor implementation that does nothing.
However one is abstract and the other is not; probably ought to make
them both abstract?

Also, there are a couple of TODOs suggesting that the interface be extended:

TODO Add .visitMethodHandle to Visitor interface
TODO Add .visitMethodType to Visitor interface

I assume these relate to the bcel6.classfile Visitor as that already
has a vistMethod declaration.

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