RFR(S) 8206115 - Use shared macros for JavaClasses::compute_offsets and MetaspaceShared::serialize_well_known_classes

[coleen.phillimore at oracle.com]

I think this change looks really good.  There's probably opportunity to 
use the X macro in more creative ways but this seems good for now.
thanks,
Coleen

On 8/15/18 12:37 AM, Ioi Lam wrote:
> https://bugs.openjdk.java.net/browse/JDK-8206115
> http://cr.openjdk.java.net/~iklam/jdk12/8206115_compute_offsets_macro.v01/ 
>
>
> As I noted in the comments on this RFE, we already have a bug where
> java_lang_Integer_IntegerCache was missing from
> MetaspaceShared::serialize_well_known_classes.
>
> To avoid such problems in the future, I added a new macro in 
> javaClasses.hpp,
> BASIC_JAVA_CLASSES_DO, which is used by JavaClasses::compute_offsets and
> JavaClasses::serialize_offsets.
>
> For clean up, I also renamed all the <Class>::serialize() functions to
> <Class>::serialize_offsets() to reflect what these functions really do.
>
> The old MetaspaceShared::serialize_well_known_classes function is now
> JavaClasses::serialize_offsets.
>
> Testing with hs tiers 1/2.
>
> Thanks
> - Ioi