types2: flip the default value of GODEBUG=gotypesalias=1

This CL changes the interpretation of the unset value
of gotypesalias to not equal "0".

This is a port of CL 577715 from go/types to types2,
with adjustments to go/types to keep the source code
in sync. Specifically:

- Re-introduce testing of both modes (gotypesalias=0,
  gotypesalias=1) in go/types.
- Re-introduce setting of gotypesalias in some of the
  tests for explicit documentation in go/types.

The compiler still uses the (now) non-default setting
due to a panic with the default setting that needs to
be debugged.

Also, the type checkers still don't call IncNonDefault
when the non-default setting of gotypesalias is used.

Change-Id: I1feed3eb334c202950ac5aadf49a74adcce0d8c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/579076
TryBot-Bypass: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
9 files changed
tree: 119d074fcee14d2e46c3b2513f97cc7a6d208c92
  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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