Use method handles for binding ungenerated invokers #8044
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JRuby extensions can be bound using bytecode-generated invokers, either pregenerated at build time or generated on the fly at runtime. In the latter case, the overhead of failing to find a pregenerated invoker, generating the new bytecode, and loading it appears to be more expensive than using invokedynamic method handles to do the binding. This PR enables using indy handles for all non-generated method bindings at runtime.