Allow binding only portions of core classes #8903
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Interface static method invocations must be emitted with the new InterfaceMethodref descriptor, which we were not doing for the generated invokers. This fixes that.
This moves IO-related Kernel methods to a separate interface which can be enabled or disabled independently of the rest of Kernel. This relates to recent discussions about making JRuby safely embeddable with only specific classes and features loaded. See other work in jruby#8893
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This is an experiment to modularize the binding of core class methods on classes which have many different sets of behaviors. Initially, the work is based on modularizing Kernel to allow optionally binding methods that access things like IO.
This relates to recent discussions about making JRuby smaller and more secure for embedded use cases that may want to be able to disable things like IO and Thread. We need to be able to disable related features in other classes and modules like Kernel for that to be fully realized.
See related work in #8893.