go/types, types2: move posVers field into group of package-specific fields (cleanup)
posVers exists once for an entire package. Move it into the group
of fields related to the entire package (and out from the group
of fields that are specific to each batch of files).
Change-Id: I40ea722578408bdf2b85db91b65680e720c0c502
Reviewed-on: https://go-review.googlesource.com/c/go/+/514998
Auto-Submit: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Griesemer <gri@google.com> Reviewed-by: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com>