Remember when I said a week ago that 17.x is nearing the branch point and it's looking good so far? Well, was broken 5 commits later, they knew it and disregarded is as "happens on just one platform". Well, surprise, it's not "just one platform", and the code is definitely broken somewhere!

reviews.llvm.org/D143241#44761
github.com/llvm/llvm-project/i