go/types: return Universe for (*Package)(nil).Scope()
go/types: return Universe for (*Package)(nil).Scope()

Port of go.dev/cl/325469.

Fixes #46594.

Change-Id: I4bcdafecaa86885360599c204678871646bb221b
Reviewed-on: https://go-review.googlesource.com/c/go/+/385997
Trust: Matthew Dempsky <e56ac2c500064424afac424d4b5e53bd0570a731@google.com>
Run-TryBot: Matthew Dempsky <e56ac2c500064424afac424d4b5e53bd0570a731@google.com>
Reviewed-by: David Chase <ae171625adc8645b8b79b7e405a6da5aba5341e0@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>

nawawi/go,CAFxX/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,golang/go,golang/go,nawawi/go,golang/go,CAFxX/go,golang/go,golang/go,golang/go,CAFxX/go,nawawi/go,nawawi/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go