RFR: 8234748: Clean up atomic and orderAccess includes

[Stefan Karlsson]

Hi all,

Please review this trivial, but large, patch to cleanup the includes of 
atomic.hpp and orderAccess.hpp.

https://cr.openjdk.java.net/~stefank/8234748/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8234748

Thanks,
StefanK