Worker Wrapper should duplicate source notes onto the wrapper

Suppose you have a definition

toIfaceTyCon :: TyCon -> IfaceTyCon

then if you compile with -g3 to enable source notes then the desugared version might look like

toIfaceTyCon = \w -> <tick> body

Worker wrapper then applies to toIfaceTyCon, and performs the WW split, at which point the tick is only moved into the worker.

$wToIfaceTyCon :: TyCon -> (# IfExtName, IfaceTyConInfo #)
$wToIfaceTyCon = \tc -> <TICK> body  

toIfaceTyCon
  = \ (w_saGx :: TyCon) ->
      case GHC.CoreToIface.$wtoIfaceTyCon w_saGx of
      { (# ww1_saJK, ww2_saJL #) ->
      GHC.Iface.Type.IfaceTyCon ww1_saJK ww2_saJL
      }

Now there is a source of allocation, IfaceTyCon, which won't get a proper entry in the IPE map because there isn't a surrounding tick. It would be better if the tick was copied onto the worker as well so the allocation could be tracked back to the definition of toIfaceTyCon.

$wToIfaceTyCon :: TyCon -> (# IfExtName, IfaceTyConInfo #)
$wToIfaceTyCon = \tc -> <TICK> body  

toIfaceTyCon
  = \ (w_saGx :: TyCon) -> <TICK> 
      case GHC.CoreToIface.$wtoIfaceTyCon w_saGx of
      { (# ww1_saJK, ww2_saJL #) ->
      GHC.Iface.Type.IfaceTyCon ww1_saJK ww2_saJL
      }