RFR: 8215995: Add specialized toArray methods to immutable collections

[Claes Redestad]

On 2019-01-02 20:55, Martin Buchholz wrote:
>     Which bounds check?
> 
> 
> On the second leg, you know you'll never hit the end of the array, so 
> you can elide the check.  But hotspot may not be so clever and may 
> re-insert it, in a slightly more expensive variant that has actual 
> exception throwing code.

I see what you mean now and perhaps that'd eliminate a branch per 
element if we did toArray inline rather than use an iterator. Might be
a reasonable optimization that can stand on it's own in a follow-up.

/Claes