dup on Range regression

JRuby 9k final:

```
>> Range.new(0, 1000).dup
NameError: `initialize' called twice
    from org/jruby/RubyRange.java:247:in `initialize_copy'
    from org/jruby/RubyKernel.java:1860:in `initialize_dup'
    from org/jruby/RubyKernel.java:1898:in `dup'
```

JRuby 1.7.20.1:

```
>> Range.new(0,1000).dup
=> 0..1000
```
