diff --git a/llvm/include/llvm/Transforms/IPO/Attributor.h b/llvm/include/llvm/Transforms/IPO/Attributor.h
--- a/llvm/include/llvm/Transforms/IPO/Attributor.h
+++ b/llvm/include/llvm/Transforms/IPO/Attributor.h
@@ -4887,7 +4887,9 @@
     bool isWrittenValueYetUndetermined() const { return !Content; }
 
     /// Return true if the value written cannot be determined at all.
-    bool isWrittenValueUnknown() const { return Content && !*Content; }
+    bool isWrittenValueUnknown() const {
+      return Content.has_value() && !*Content;
+    }
 
     /// Return the type associated with the access, if known.
     Type *getType() const { return Ty; }