ghci: Fix rec statements in interactive prompt

We desugar a recursive Stmt to somethign like

  (a,_,c) <- mfix (\(a,b,_) -> do { ... ; return (a,b,c) })
  ...stuff after the rec...

The knot-tied tuple must contain
* All the variables that are used before they are bound in the `rec` block
* All the variables that are used after the entire `rec` block

In the case of GHCi, however, we don't know what variables will be used
after the `rec` (#20206).  For example, we might have

    ghci>  rec { x <- e1; y <- e2 }
    ghci>  print x
    ghci>  print y

So we have to assume that *all* the variables bound in the `rec` are used
afterwards.  We use `Nothing` in the argument to segmentRecStmts to signal
that all the variables are used.

Fixes #20206

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