go/ast: update (*File).Imports field in SortImports
Fixes #69694
Change-Id: I7884d42482f4f9d17e7d050d7c7730f20948169d
GitHub-Last-Rev:
ecd6efabaa43cc87e31e94002febc9ed4273125a
GitHub-Pull-Request: golang/go#69695
Reviewed-on: https://go-review.googlesource.com/c/go/+/616340
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>