cmd/compile: implement range over func

Add compiler support for range over functions.
See the large comment at the top of
cmd/compile/internal/rangefunc/rewrite.go for details.

This is part of a sequence of CLs demonstrating a proposal
to expand the applicability of range loops.

For proposal #61405.

Change-Id: I05717f94e63089c503acc49b28b47edeb4e011b4
17 files changed
tree: 7c0203704190b5f0376fdf3e1ea2799387b63d9d
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  12. go.env

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