cmd/go/internal/modload: add line numbers to godebug errors
In addition, add a line number to the go.work error for multiple use statements
for the same directory. Also clean up the error prefix for go.work
errors now containing line numbers.
Fixes #67623
Change-Id: Ia7edcc50f7d7ec907b4a9eb4fe270c75d04c1fa5
Reviewed-on: https://go-review.googlesource.com/c/go/+/590135 Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Auto-Submit: Michael Matloob <matloob@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>