Index: include/llvm/CodeGen/MIRYamlMapping.h
===================================================================
--- include/llvm/CodeGen/MIRYamlMapping.h
+++ include/llvm/CodeGen/MIRYamlMapping.h
@@ -489,6 +489,7 @@
   bool FailedISel = false;
   // Register information
   bool TracksRegLiveness = false;
+  bool HasWinCFI = false;
   std::vector<VirtualRegisterDefinition> VirtualRegisters;
   std::vector<MachineFunctionLiveIn> LiveIns;
   Optional<std::vector<FlowStringValue>> CalleeSavedRegisters;
@@ -512,6 +513,7 @@
     YamlIO.mapOptional("selected", MF.Selected, false);
     YamlIO.mapOptional("failedISel", MF.FailedISel, false);
     YamlIO.mapOptional("tracksRegLiveness", MF.TracksRegLiveness, false);
+    YamlIO.mapOptional("hasWinCFI", MF.HasWinCFI, false);
     YamlIO.mapOptional("registers", MF.VirtualRegisters,
                        std::vector<VirtualRegisterDefinition>());
     YamlIO.mapOptional("liveins", MF.LiveIns,
Index: lib/CodeGen/MIRParser/MIRParser.cpp
===================================================================
--- lib/CodeGen/MIRParser/MIRParser.cpp
+++ lib/CodeGen/MIRParser/MIRParser.cpp
@@ -355,6 +355,7 @@
   if (YamlMF.Alignment)
     MF.setAlignment(YamlMF.Alignment);
   MF.setExposesReturnsTwice(YamlMF.ExposesReturnsTwice);
+  MF.setHasWinCFI(YamlMF.HasWinCFI);
 
   if (YamlMF.Legalized)
     MF.getProperties().set(MachineFunctionProperties::Property::Legalized);