Teach live intervals to not crash on dead livein regs


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23206 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.h b/lib/CodeGen/LiveIntervalAnalysis.h
index f7f4569..02ecea7 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.h
+++ b/lib/CodeGen/LiveIntervalAnalysis.h
@@ -164,7 +164,8 @@
     void handlePhysicalRegisterDef(MachineBasicBlock* mbb,
                                    MachineBasicBlock::iterator mi,
                                    LiveInterval& interval,
-                                   unsigned SrcReg, unsigned DestReg);
+                                   unsigned SrcReg, unsigned DestReg,
+                                   bool isLiveIn = false);
 
     /// Return true if the two specified registers belong to different
     /// register classes.  The registers may be either phys or virt regs.