ghci: can't load module BitSet, and some others

[Marc Weber]

They do no longer exist:
> BitSet
> FieldLabel
> IlxGen
> RegisterAlloc

I've found this kind of error at least twice
error "RegisterAlloc.livenessSCCs"
        ^^^^^^^^^
I've found this kind of error twice in ghc code.. Should this be updated
to the new module name?

Don't know about these modules:
> Java
> JavaGen
> PrintJava
Does anyone know?

Sincerly
Marc Weber