go/types, types2: simplify Checker.resolveBaseTypeName (cleanup)

Method receivers that denote cgo-generated types are not permitted
per issues #60725 and #57926. There's no need to collect such methods
in the first place. Simplify Checker.resolveBaseTypeName so that it
doesn't find a base type name in these cases.

Also, simplify the test case for issue #59944 and update it to use
current cgo-generated output.

For #60725.
For #57926.
For #59944.

Change-Id: I70594daebc3d4d594c5b06be138f66f8927b0e58
Reviewed-on: https://go-review.googlesource.com/c/go/+/630395
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>
4 files changed
tree: 55fd12178214a5fa0ee18dd2f9ea06159af1be48
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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