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LiveRangeEdit::eliminateDeadDef is used to remove dead define instructions after rematerialization. To remove a VNI for a vreg from its LiveInterval, LiveIntervals::removeVRegDefAt is used. However, after non-PHI VNIs are all removed, PHI VNI are still left in the LiveInterval. Such unused vregs will be kept in RegsToSpill[] at the end of InlineSpiller::reMaterializeAll and spiller will allocate stackslot for them. The fix is to get rid of unused reg by checking whether it has non-dbg reference instead of whether it has non-empty interval. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259895 91177308-0d34-0410-b5e6-96231b3b80d8
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