The same way c# used to do it. C# provided dynamic code generation in both byte-code-level, and AST/lamba implementations. And even provided an interactive C# "interpreter" that actually used dynamic code generation under the covers. All of which died with .net core. I rather suspected that Microsoft decided that dynamic code generation was far too useful for writing cloaked viruses, and not quite generally useful enough to justify the effort.
You'd have to generate reflection data at compile time. And llvm supports dynamic code generation, so that's not a problem either.
Not really sure why anyone would want to do an interpreted language though.
Expression Trees and IQueryable<T> compilation did not die and remain fully supported features. For example EF Core uses them for query compilation. 'dynamic' did not die either even though it should not be used because there are usually better constructs for this.