TH: GHC 7.7 compatibility
TH: GHC 7.7 compatibility

`tySynInstD` now bundles together its two paramters in an `TySynEqn`.

rpglover64/lens,cdepillabout/lens,hvr/lens,Icelandjack/lens,Fuuzetsu/lens,timjb/lens,ddssff/lens,danidiaz/lens,omefire/lens,cchalmers/lens,Gabriel439/lens,hvr/lens