e9a1881b90 refactor: add a function for determining if a block is pruned or not (Karl-Johan Alm)
Pull request description:
The check for whether a block is pruned or not is sufficiently obscure that it deserves a macro. It is also used in 2 places, ~~with more coming, e.g. #10757~~ (turns out it was a move, not an addition).
Tree-SHA512: b9aeb60663e1d1196df5371d5aa00b32ff5d4cdea6a77e4b566f28115cce09570c18e45e4b81a4033f67c4135c8e32c027f67bae3b75c2ea4564285578a3f4dd