RFR (S) 8198717: Remove compute_optional_offset

[Lois Foltan]

Looks good.
Lois

On 9/18/2018 7:28 PM, coleen.phillimore at oracle.com wrote:
> Summary: remove optional_offset computation and related unused code 
> from javaClasses for reflection.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/8198717.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8198717
>
> Tested with hs-tier1 and 2.
>
> Thanks,
> Coleen