Instead of LLM => some language generated output => its compiler => executable
We will get LLM => magic pixie dust => executable
The dream of many corporate overlords.
This has been tried before with UML, see Rational, Together or Enterprise Architect, however LLMs bring an additional automation step to the whole thing.
Indeed one of the challenges with using machine learning as a part of compilation is reasoning about it when trying to investigate reported defects.
Some of the research focuses on simpler/more practical domains, such as the ordering of the compiler passes.
What probably does have real merit is tying a superoptimiser to a LLM, provided you've got the SAT solver included in the mix as well to know if it worked.