2581 - make space for the refcount in address:shared

We don't yet actually maintain the refcount. That's next.

Hardest part of this was debugging the assume-console scenarios in layer
85. That took some detailed manual diffing of traces (because the output
of diff was no good).

New tracing added in this commit add 8% to .traces LoC. Commented out
trace() calls (used during debugging) make that 45%.

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