runtime: add scan trace for checkfinalizers>1 This change dumps a scan trace (each pointer marked and where it came from) for the partial GC cycle performed by checkfinalizers mode when checkfinalizers>1. This is useful for quickly understanding why certain values are reachable without having to pull out tools like viewcore. For #72949. Change-Id: Ic583f80e9558cdfe1c667d27a1d975008dd39a9c Reviewed-on: https://go-review.googlesource.com/c/go/+/662038 Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org> Auto-Submit: Michael Knyszek <mknyszek@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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