Fix CompUnit::PrecompilationUnit::File::bytecode not returning bytecode
Fix CompUnit::PrecompilationUnit::File::bytecode not returning bytecode

Since commit 81ac37f88b294ef90b336562509d0cd51dc0c9a3 the bytecode method only
returned the bytecode when it wasn't already initialized.

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