RFR: 8076457: Fix includes of inline.hpp in GC code

[Stefan Karlsson]

Hi,

Please review this patch to fix the last few places in the GC code where 
inline.hpp files are included from hpp files.

http://cr.openjdk.java.net/~stefank/8076457/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8076457

This patch builds upon the patch in:
http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-April/012607.html

Thanks,
StefanK