cmd/go: add Package.StaleReason for debugging with go list
It comes up every few months that we can't understand why the go command is rebuilding some package. Add diagnostics so that the go command can explain itself if asked. For #2775, #3506, #12074. Change-Id: I1c73b492589b49886bf31a8f9d05514adbd6ed70 Reviewed-on: https://go-review.googlesource.com/22432Reviewed-by:Rob Pike <r@golang.org>
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