These tests, and this feature really, is a bit tricky since our btrees
reinline "lazily". That is, our btrees only check if they can inline
during compaction, allowing potentially inlinable btrees to remain
uninlined.
This better utilizes any erased storage in the btree's rbyd, but adds
some corner cases we need to be concerned about.
Added because of some ongoing btree rewrite work, where it did catch
incorrect behavior.
Christopher Haster
3dbc986752