ClassLoader API to look up class files

[Rafael Winterhalter]

That is only true for Class::getResource which resolves resources relative
to the loaded class's class file location. Java agents typically use
ClassLoader::getResource(AsStream) as the loaded class is not available in
the general case of transforming, and not retransforming, a class. For
example, when instrumenting a newly loaded class A in a
ClassFileTransformer, it might not be the case that its superclass B is
loaded. If class B exists in two versions as part of a multi-release jar
file, currently, you need to query the class loader of A as the JVM would
do. When loading a class, ClassLoader::findClass respects the multi-release
characteristic. But for ClassLoader::getResource, this is not the case.
This is why I want to suggest a new method where this is possible, as the
intend to resolve a class file is explicit. Currently, you need to iterate
as the ClassLoader does not expose any relevant information.
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