Move reifyGHCi function into GhciMonad type class
Move reifyGHCi function into GhciMonad type class

This was the suggested change in !176 but missed the batch merge (!263).

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc