go/ast: don't MergeLine in SortImports when last import on the same line as RParen
Fixes #69183
Change-Id: I8b78dadaa8ba91e74ea2bfc21abd6abe72b7e38b
GitHub-Last-Rev:
1a41f9e8e3bef9926993813568902d1a77c991c1
GitHub-Pull-Request: golang/go#69187
Reviewed-on: https://go-review.googlesource.com/c/go/+/610035
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Commit-Queue: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>