Restructure IO::Path.slurp a bit
Restructure IO::Path.slurp a bit

- mostly for readability, using ternaries instead of nqp::if
- don't store the blob in the method, pass it on as is

nbrown/rakudo,MasterDuke17/rakudo,nbrown/rakudo,tbrowder/rakudo,tbrowder/rakudo,labster/rakudo,MasterDuke17/rakudo,nbrown/rakudo,softmoth/rakudo,tbrowder/rakudo,tbrowder/rakudo,rakudo/rakudo,salortiz/rakudo,rakudo/rakudo,salortiz/rakudo,softmoth/rakudo,salortiz/rakudo,nbrown/rakudo,nbrown/rakudo,MasterDuke17/rakudo,tony-o/rakudo,tony-o/rakudo,tony-o/rakudo,salortiz/rakudo,tbrowder/rakudo,rakudo/rakudo,rakudo/rakudo,labster/rakudo,labster/rakudo,salortiz/rakudo,tony-o/rakudo,MasterDuke17/rakudo,softmoth/rakudo,softmoth/rakudo,labster/rakudo,nbrown/rakudo,rakudo/rakudo,MasterDuke17/rakudo,rakudo/rakudo,MasterDuke17/rakudo,tony-o/rakudo,salortiz/rakudo,softmoth/rakudo,labster/rakudo,tbrowder/rakudo,tony-o/rakudo,labster/rakudo