RFR: 8157907: Incorrect inclusion of atomic.hpp instead of atomic.inline.hpp

[David Holmes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8157907

webrev: http://cr.openjdk.java.net/~dholmes/8157907/webrev/

Following on from the discussion here:

http://mail.openjdk.java.net/pipermail/hotspot-dev/2016-August/024171.html

this is the formal RFR for these changes.

Summary:
- fold atomic.inline.hpp into atomic.hpp
- rename atomic_*.inline.hpp files to atomic_*.hpp
- only include atomic.hpp where needed
- remove unnecessary additional includes

I need someone to confirm these changes build fine on: ppc, aarch64 and 
zero please.

Thanks,
David