It's the end of an era. The IRC channel was previously where the community gathered to discuss technical topics but is now a ghost town where the primary activity is moderators (me) kickbanning the same individual dozens of times a day for CoC violations and the secondary activity is telling the occasional person to come to Discord for help. The number of people engaging on IRC for the community's intended purposes seems to be roughly one person a month. So this removes all remaining mentions of IRC from our documentation so that it no longer appears to be an "official" channel for communicating with the community. It also removes IRC handles from the various maintainers lists, since those would stand out as confusing anachronisms. The IRC channel topic already recommends people come to the Discord server. There is no way to "shut down" an IRC channel such that it no longer exists, so the channel will continue to exist on OFTC, but will be unmoderated. (This was previously discussed in https://discourse.llvm.org/c/llvm/5 but some mentions persisted.)
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