lang: ast, interfaces: Plumb in the Graph sig changes and value pointers
The Graph signature changes are needed for future function work, and it also fits in nicely with the need for storing the value pointer for each function node. These are used to later extract values during the Output stage. Sam deserves all of the credit for realizing both of these points and convincing me to make the change! It worked out great, cheers! Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
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