Index: include/clang/Sema/Lookup.h
===================================================================
--- include/clang/Sema/Lookup.h
+++ include/clang/Sema/Lookup.h
@@ -540,7 +540,7 @@
   }
 
   /// Clears out any current state.
-  void clear() {
+  LLVM_ATTRIBUTE_REINITIALIZES void clear() {
     ResultKind = NotFound;
     Decls.clear();
     if (Paths) deletePaths(Paths);