big_lshift and big_rshift are merged.
(big_shift2): New function.
(big_lshift): Use big_shift3.
(big_rshift): Ditto.
(check_shiftdown): Removed.
(rb_big_lshift): Use big_shift2 and big_shift3.
(rb_big_rshift): Ditto.
(big_lshift): Removed.
(big_rshift): Ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41942 b2dd03c8-39d4-4d8f-98ff-823fe69b080e