go/types: Set Signature.Recv for imported types
go/types: Set Signature.Recv for imported types

R=golang-dev, bradfitz, gri
CC=golang-dev
https://codereview.appspot.com/7065046

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang