diff --git a/clang/lib/AST/ODRHash.cpp b/clang/lib/AST/ODRHash.cpp
--- a/clang/lib/AST/ODRHash.cpp
+++ b/clang/lib/AST/ODRHash.cpp
@@ -889,9 +889,12 @@
   void VisitFunctionType(const FunctionType *T) {
     AddQualType(T->getReturnType());
     T->getExtInfo().Profile(ID);
-    Hash.AddBoolean(T->isConst());
-    Hash.AddBoolean(T->isVolatile());
-    Hash.AddBoolean(T->isRestrict());
+    if (T->isFunctionProtoType()) {
+      // These values are undefined for FunctionNoProtoType
+      Hash.AddBoolean(T->isConst());
+      Hash.AddBoolean(T->isVolatile());
+      Hash.AddBoolean(T->isRestrict());
+    }
     VisitType(T);
   }