Index: include/llvm/ADT/PointerUnion.h
===================================================================
--- include/llvm/ADT/PointerUnion.h
+++ include/llvm/ADT/PointerUnion.h
@@ -158,7 +158,7 @@
     assert(
         get<PT1>() == Val.getPointer() &&
         "Can't get the address because PointerLikeTypeTraits changes the ptr");
-    return (PT1 *)Val.getAddrOfPointer();
+    return const_cast<PT1 *>((const PT1 *)Val.getAddrOfPointer());
   }
 
   /// Assignment from nullptr which just clears the union.