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66643da8fc
ARM64 was scalarizing some vector comparisons which don't quite map to AArch64's compare and mask instructions. AArch64's approach of sacrificing a little efficiency to emulate them with the limited set available was better, so I ported it across. More "inspired by" than copy/paste since the backend's internal expectations were a bit different, but the tests were invaluable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206570 91177308-0d34-0410-b5e6-96231b3b80d8