Filterless subroutine prototypes

Leader: Michael Schwern

I believe I have figured out how to do subroutine prototypes without a source filter. It involves a small amount of not-too-deep XS magic liberally stolen from one of Simon Cozens' unfinished modules and Scalar::Util::set_prototype(). The pieces are there, I need someone with some XS sk1llz to help put them together.

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