Intercept Class.forName and similar calls to perform package renaming dynamically

[bjhargrave]

The transformer can be made to handle renaming all static references, but references to types in a String, which can be assembled at runtime, will need to be handles at runtime.

The tool can mutate the call sites to methods like Class.forName, ClassLoader.loadClass, etc. to call a supplied interceptor method which can inspect the assembled string and perform any renames before calling the method from the original call site.

[From https://github.com/bjhargrave/transformer-poc/issues/2]

[bjhargrave]

My thinking is that this can be done with constant pool manipulation. The constant pool methodRef entry for Class.forName is altered to be a methodRef to a method (in some transformer helper class added to the artifact) which does the class name string argument transformation before calling the Class.forName method and returning the result. Similar constant pool entry alterations would be done for other methodRefs to ClassLoader.loadClass, etc.

This avoids having to process and modify method bodies in all the methods' CodeAttributes.

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