pypy*: Add basic --jit arg completion

Author: scop

completions/python

@@ -37,6 +37,11 @@ _python()
                 -P "$prefix" -- "$cur" ) )
             return 0
             ;;
+        --jit)
+            # TODO: quite a few others, parse from "--jit help" output?
+            COMPREPLY=( $( compgen -W "help off" -- "$cur" ) )
+            return 0
+            ;;
         !(?(*/)python*([0-9.])|?(*/)pypy*([0-9.])|-?))
             [[ $cword -lt 2 || ${words[cword-2]} != -[QWX] ]] && _filedir
             ;;