Remove not used node_type NODE_IASGN2
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60302 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Remove not used node_type NODE_IASGN2
node_type has not been used since r11813.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60302 b2dd03c8-39d4-4d8f-98ff-823fe69b080e