Porting/XMRig

TimothyPearson ported XMRig to POWER9. Unfortunately, Monero has since changed their PoW algorithm (in March 2019), so the POWER9 port of XMRig is likely to only work for chains that haven't adopted the March 2019 Monero PoW.

Also see Porting/RandomX for Monero's current PoW algorithm.