RFR: 8054823: Add size_t as a valid VM flag type

[Stefan Karlsson]

Hi all,

I propose that we add 'size_t' as a valid VM flag type. This will help 
with type safety, since we won't have to cast back and forth between the 
two types.

This patch adds the framework, but only changes one of the flags. I 
choose to change one of our experimental flags, so that I could write 
tests for this change.

Please, review this patch:
  http://cr.openjdk.java.net/~stefank/8054823/webrev.00/
  https://bugs.openjdk.java.net/browse/JDK-8054823

thanks,
StefanK