Find the candidate block index entry with the most work.
Declared in <validation.h>
[[requires_capability(0x7f9513ab5b88), requires_capability(0x7f9502c98bf8), requires_capability(0x7f952544a928), requires_capability(0x7f9517400c08)]]
CBlockIndex*
FindMostWorkChain();
The most-work candidate block index entry, or nullptr if none qualifies.