compiler: reimplement interface type asserts #4375
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This is a big reimplementation that simplifies the compiler a lot. Instead of storing the method set in metadata and lowering the type asserts as a whole program pass, this change just puts the list of methods in the type code (and a separate global for the interface type).
I'm still working on this. I'm not very happy with the binary size increase (~4%) but I have a few ideas how to reduce it. But I made a PR for initial review for those interested (@dgryski?)
This is also a step in the direction of #2870.