Change Bool::Get to return a handle instead of a pointer to a raw object.

runtime/lib/object.cc

Index: runtime/lib/object.cc
diff --git a/runtime/lib/object.cc b/runtime/lib/object.cc
index 086198a7186156c19235c82ab5f9be29fcfaf00e..de01c97faddf19fdbf41dfe9e54ab28d3c345ec0 100644
--- a/runtime/lib/object.cc
+++ b/runtime/lib/object.cc
@@ -139,7 +139,7 @@ DEFINE_NATIVE_ENTRY(Object_instanceOf, 5) {
         Symbols::Empty(), malformed_error_message);
     UNREACHABLE();
   }
-  return Bool::Get(negate.value() ? !is_instance_of : is_instance_of);
+  return Bool::Get(negate.value() ? !is_instance_of : is_instance_of).raw();
 }