fix a very weird precomp/BEGIN-use bug
fix a very weird precomp/BEGIN-use bug

I cannot explain how, but it fixes:
$ perl6 --target=mbc --output=/dev/null t/spec/packages/RT125090.pm
===SORRY!===
Missing serialize REPR function for REPR NativeRef

tony-o/rakudo,tbrowder/rakudo,tony-o/rakudo,Gnouc/rakudo,salortiz/rakudo,b2gills/rakudo,sjn/rakudo,salortiz/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,jonathanstowe/rakudo,rakudo/rakudo,tony-o/rakudo,raydiak/rakudo,MasterDuke17/rakudo,salortiz/rakudo,azawawi/rakudo,samcv/rakudo,Gnouc/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,salortiz/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,azawawi/rakudo,MasterDuke17/rakudo,labster/rakudo,azawawi/rakudo,labster/rakudo,tony-o/rakudo,rakudo/rakudo,tbrowder/rakudo,zostay/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,awwaiid/rakudo,usev6/rakudo,b2gills/rakudo,b2gills/rakudo,nbrown/rakudo,azawawi/rakudo,lucasbuchala/rakudo,sjn/rakudo,MasterDuke17/rakudo,rakudo/rakudo,usev6/rakudo,raydiak/rakudo,zostay/rakudo,rakudo/rakudo,labster/rakudo,tbrowder/rakudo,raydiak/rakudo,softmoth/rakudo,nbrown/rakudo,MasterDuke17/rakudo,zostay/rakudo,tbrowder/rakudo,awwaiid/rakudo,tbrowder/rakudo,Gnouc/rakudo,b2gills/rakudo,softmoth/rakudo,jonathanstowe/rakudo,lucasbuchala/rakudo,b2gills/rakudo,Gnouc/rakudo,rakudo/rakudo,MasterDuke17/rakudo,labster/rakudo,softmoth/rakudo,samcv/rakudo,lucasbuchala/rakudo,salortiz/rakudo,labster/rakudo,azawawi/rakudo,samcv/rakudo,softmoth/rakudo,tbrowder/rakudo,awwaiid/rakudo,ab5tract/rakudo,jonathanstowe/rakudo,labster/rakudo,tony-o/rakudo,salortiz/rakudo,zostay/rakudo,softmoth/rakudo,nbrown/rakudo,nbrown/rakudo,nbrown/rakudo,rakudo/rakudo,jonathanstowe/rakudo,usev6/rakudo,ab5tract/rakudo,samcv/rakudo,tony-o/rakudo,sjn/rakudo,samcv/rakudo,ab5tract/rakudo,ab5tract/rakudo,sjn/rakudo,usev6/rakudo,raydiak/rakudo,sjn/rakudo,nbrown/rakudo,usev6/rakudo