I have happened to find seemingly related bug in PIC handing on other PIC-sensitive RISCs:
https://phabricator.haskell.org/D177 (also in ghc's master)
I think it might help you to get ghci on your mipsel.
The following error occurred on 31f43e806beeac434b1330ba5a04746ae79275fc: /usr/bin/ar: creating libraries/haskeline/dist-install/build/libHShaske_2vN4xw6O9xk8OwkNKI7sbg.a "rm" -f libraries/haskeline/dist-install/build/libHShaske_2vN4xw6O9xk8OwkNKI7sbg.a.contents Panic! libraries/Cabal/Cabal/dist-install/build/Language/Haskell/Extension.hi exists, but libraries/Cabal/Cabal/dist-install/build/Language/Haskell/Extension.dyn_o does not. make[1]: *** [libraries/Cabal/Cabal/dist-install/build/Language/Haskell/Extension.dyn_o] Error 1 make: *** [all] Error 2