During work on JDK-8342466, the Javadoc work for attributes, it's discovered that code model has a lot of inconsistencies with attributes. For example:

1. It does not stream user or undefined attributes;
2. It may write an incompatible StackMapTable as-is, disrupting the labels.
3. Type annotations are delivered only if debug elements are allowed but is not dropped from writing if it's off... (this one may be fine)

Since this is large in scale, the plan is to fix for 25 only, and write a release note indicating these behavioral changes related to the fix.