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Outside ARM world, SPARC has had hardware memory tagging for ages and it used on Solaris by default.

IBM s/370 (possibly even s/360) too had memory page tagging -- see instructions ISK / ISKE.

Yes, Burroughs as well in 1961.

The point was more about systems where we have to deal with C, or derived systems languages, and the related culture that performance trumps safety.