Re-use a "fail cursor" in simple regex matches
Re-use a "fail cursor" in simple regex matches

This saves at least 5% off a program doing regex matches in a tight
loop, like:

    "asdf123fdsa321" ~~ /\d+/ for ^300_000

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