HaRe-0.6: tools/base/transforms/Flags.ghc

RemoveIrrefPatsBaseStruct.hs: -fallow-undecidable-instances
RemoveListComp.hs: -fallow-undecidable-instances -fno-monomorphism-restriction
Substitute.hs: -fno-monomorphism-restriction
SubstituteBaseStruct.hs: -fallow-undecidable-instances -fno-monomorphism-restriction