// uses regs before it defs them.
if (!MO.isReg() || !MO.getReg() || !MO.isUse())
continue;
-
+
+ // Ignore helpful kill flags from earlier passes.
+ MO.setIsKill(false);
+
LastUseDef[MO.getReg()] = std::make_pair(I, i);
if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) continue;