go/types, types2: remove special case for external types in validType Because validType doesn't modify global state anymore, there's no need to ignore imported types. When we start tracking type parameters, we need to include imported types because they may contribute to cycles that invalidate a type. This CL effectively reverts CL 202483 (issue #35049, which doesn't apply anymore because we don't change the state of imported objects). Preparation for fixing issue #48962. For #35049. For #48962. Change-Id: I06f15575ad197375c74ffd09c222250610186b15 Reviewed-on: https://go-review.googlesource.com/c/go/+/378675 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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