Commit fe708871bd broke cross-module inlining for modules that are
compiled in different Racket processes. The problem is that
cross-module information is represented by prefab structures, and the
change caused Chez Scheme's fasl for prefabs to generate a different
structure type on different runs.
To solve the problem, use `racket/fasl` for cross-module information,
instead. But cross-module information also has inlining information as
correlated objects, so make those supported by `racket/fasl`, too.
f27dbb7951