ppc patch queue for 2021-03-31 Here's another set of patches for the ppc target and associated machine types. I'd hoped to send this closer to the hard freeze, but got caught up for some time chasing what looked like a strange regression, before finally concluding it was due to unrelated failures on the CI. This is just a handful of fairly straightforward fixes, plus one performance improvement that's simple and beneficial enough that I'm considering it a "performance bug fix".