Index: lib/CodeGen/CFIInstrInserter.cpp
===================================================================
--- lib/CodeGen/CFIInstrInserter.cpp
+++ lib/CodeGen/CFIInstrInserter.cpp
@@ -293,6 +293,8 @@
   unsigned ErrorNum = 0;
   for (MachineBasicBlock &CurrMBB : MF) {
     const MBBCFAInfo &CurrMBBInfo = MBBVector[CurrMBB.getNumber()];
+    if (&CurrMBB != &MF.front() && CurrMBB.pred_empty())
+      continue;
     for (MachineBasicBlock *Succ : CurrMBB.successors()) {
       const MBBCFAInfo &SuccMBBInfo = MBBVector[Succ->getNumber()];
       // Check that incoming offset and register values of successors match the