Sylvain Henry authored Feb 26, 2020 and Marge Bot committed Mar 11, 2020

* GHC.Iface.Recomp: recompilation avoidance stuff
* GHC.Iface.Make: mkIface*

Moved `writeIfaceFile` into GHC.Iface.Load alongside `readIface` and
renamed it `writeIface` for consistency.