There are three WT_ORDERED_READs in generations.c that have the comment: "Ensure we only read the value once.". The investigation in WT-11280 highlighted that these WT_ORDERED_READs effectively serve no purpose as they aren't enforcing ordering and the generation arrays are all volatile already.

The code wants READ_ONCE semantics and already has it but also chose to use ordered reads.

There are other places in the code where obvious volatile casts exist to achieve READ_ONCE, we should also convert those.