Consider gofrontend as a new foundation for goism

[quasilyte]

https://github.com/golang/gofrontend

This needs a lot of investigation.
If this Go compiler frontend really de-coupled from GCC now and can be used to enable new targets, maybe Emacs Lisp would be great addition to it.

[quasilyte]

This can make sexp and sexpconv stuff obsolete (good thing).