go/types, types2: instantiated interfaces must be concurrency safe
It is the responsibility of go/types to complete any interface it
creates, except for those created by the user using NewInterface.
However, this was not being done for interfaces created during
instantiation.
Fix this by (rather carefully) ensuring that all newly created
interfaces are eventually completed.
Fixes golang/go#61561
Change-Id: I3926e7c9cf80714838d2c1b5f36a2d3221c60c41
Reviewed-on: https://go-review.googlesource.com/c/go/+/513015
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@google.com>