Array addition and array sum Panama benchmarks

[Roland Westrelin]

> I had concerns about mismatched accesses some of the transformations in 
> 8253734 introduce. (There's a comment in the description [1].)
>
> Personally, I prefer to see vectorizer handling "MoveX2Y (LoadX mem)" 
> => "VectorReinterpret (LoadVector mem)" well and then introduce rules to 
> strength-reduce it to mismatched access.

Thanks for the comments, Vladimir. I created:

https://bugs.openjdk.org/browse/JDK-8329077

to track this one.

Roland.