Reduce early inlining

Fallout from #8939: Inlining during typing is a problem in many display situations. We should try to avoid inlining during typing and instead do it during post-processing.

We can still do it before saving the class state so that we don't have to repeat it on each server build. This way, the normal AST version is in `cf_expr_unoptimized` and the one with applied inline calls is in `cf_expr` after `cl_restore()` has been called.

This requires identifying in which cases early inline is a hard requirement, e.g. "constant expression required" situations.