Prevent flushing of code that was set with %SetCode.

src/objects-visiting-inl.h

Index: src/objects-visiting-inl.h
diff --git a/src/objects-visiting-inl.h b/src/objects-visiting-inl.h
index add247ea45cda0e3f7c97de7e8b24f9a8f632106..9b39bef2a138a912e9e272bb7b16a1b2bd80d045 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -566,14 +566,14 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(
     return false;
   }
 
-  // If this is a full script wrapped in a function we do no flush the code.
+  // If this is a full script wrapped in a function we do not flush the code.
   if (shared_info->is_toplevel()) {
     return false;
   }
 
-  // If this is a native function we do not flush the code because %SetCode
-  // breaks the one-to-one relation between SharedFunctionInfo and Code.
-  if (shared_info->native()) {
+  // If this is a function initialized with %SetCode then the one-to-one
+  // relation between SharedFunctionInfo and Code is broken.
+  if (shared_info->dont_flush()) {
     return false;
   }