Split GHC.HsToCore.Foreign.Decl
Refactoring of GHC.HsToCore.Foreign.Decl
in preparation for the JS backend.
We now have GHC.HsToCore.Foreign.{C,Prim,Utils}
modules in addition to GHC.HsToCore.Foreign.Decl
.
The JS backend will add a GHC.HsToCore.Foreign.JavaScript
module with only minimal changes to GHC.HsToCore.Foreign.Decl
.