Allow a ParseInfo without a script for %SetCode users

src/parsing/parse-info.h

Index: src/parsing/parse-info.h
diff --git a/src/parsing/parse-info.h b/src/parsing/parse-info.h
index 83b7f79f5fbc8f84bf150ac5b9e2cb1ffbc0dafb..a53626fdce255613f49d5934dbe84d216ffac5a4 100644
--- a/src/parsing/parse-info.h
+++ b/src/parsing/parse-info.h
@@ -42,6 +42,8 @@ class V8_EXPORT_PRIVATE ParseInfo {
 
   ~ParseInfo();
 
+  static ParseInfo* AllocateWithoutScript(Handle<SharedFunctionInfo> shared);
+
   Zone* zone() const { return zone_.get(); }
 
   std::shared_ptr<Zone> zone_shared() const { return zone_; }