Further optimizing domain's follower iterator
Further optimizing domain's follower iterator

Following Steve's lead, made the domain follower do what
the array follwer does and optimize the addition out of
the inner loop.  Probably doesn't have a performance
impact on RA, but should for other codes that do domain
iteration in an inner loop.



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@14930 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

sungeunchoi/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,sungeunchoi/chapel,chizarlicious/chapel,sungeunchoi/chapel,CoryMcCartan/chapel