review request (L) - 6423256 GC stacks

[John Coomes]

John Coomes (John.Coomes at sun.com) wrote:
> I'd appreciate reviews of
> 
> 	6423256: GC stacks should use a better data structure
> 
> 	http://cr.openjdk.java.net/~jcoomes/6423256-gc-stacks/
> 
> See the comments at the top of the webrev and in file stack.hpp for
> some hints/details.

I've updated the webrev at the url above after some good review
feedback from Andrey (thanks!) and syncing with current hotspot-gc.
The changes are mostly syntactic, differences from the previous round
are summarized the top of the webrev.

Testing is clean.

-John