Remove needless calls to infix:<,> in [sS]/// codegen
Remove needless calls to infix:<,> in [sS]/// codegen

After a discussion[^1] and testing the output of old tickets[^2],
it looks like these are no longer needed. After their removal, the
bugs referenced by tickets do not re-appear and stresstest passes.

[1] https://irclog.perlgeek.de/perl6/2016-12-10#i_13717904
[2] https://irclog.perlgeek.de/perl6/2016-12-10#i_13718025

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