go/types, types2: use correct underlying type in union set computation
Fixes #51658. Change-Id: Ibf415d7e12849b8f50b58d74713613d4e65bc347 Reviewed-on: https://go-review.googlesource.com/c/go/+/392575 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by:Robert Findley <rfindley@google.com>
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