go/types, types2, go/ast, go/parser: remove support for type lists

This is a rough port of CL 354131 to go/* libraries, though in practice
I just tried to reconcile any places where the phrase "type list"
occurred in the source. This resulted in adjusting quite a bit more code
than initially expected, including a few lingering cases in the
compiler.

Change-Id: Ie62a9e1aeb831b73931bc4c78bbb6ccb24f53fb0
Reviewed-on: https://go-review.googlesource.com/c/go/+/359135
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
28 files changed
tree: 444093f42ed4eb8553e14482aef2e08b1c74086e
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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