Sylvain Henry authored Jun 01, 2020 and Marge Bot committed Jul 21, 2020

* add StgPprOpts datatype
* remove Outputable instances for types that need `StgPprOpts` to be
  pretty-printed and explicitly call type specific ppr functions
* add default `panicStgPprOpts` for panic messages (when it's not
  convenient to thread StgPprOpts or DynFlags down to the ppr function
  call)