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It turns out this combine was always somewhat flawed -- there are cases where nested VZEXT nodes *can't* be combined: if their types have a mismatch that can be observed in the result. While none of these show up in currently, once I switch to the new vector shuffle lowering a few test cases actually form such nested VZEXT nodes. I've not come up with any IR pattern that I can sensible write to exercise this, but it will be covered by tests once I flip the switch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219044 91177308-0d34-0410-b5e6-96231b3b80d8
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