Rewrite eg to use go/packages, so that it works with Go modules.
There are two known regressions:
* lost build tag support
* you can't use a template to add a new dependency
These can be re-added at a future point as needed.
Change-Id: I2b59bb5e101c738a4d4c40e84a12c5b3a19bcd18
Reviewed-on: https://go-review.googlesource.com/c/tools/+/258304
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>