Adds a missing piece from part 5 PR #5713 where raw2trace's thread_data_ was indirected to support a subclass extending it. However, its destructor was not virtual, which prevented such extension. We address that here.
Issue: #5538
Adds a missing piece from part 5 PR #5713 where raw2trace's thread_data_ was indirected to support a subclass extending it. However, its destructor was not virtual, which prevented such extension. We address that here.
Issue: #5538