RFR: 8075416: Cleanup GC include dependencies in memoryPool.hpp

[Stefan Karlsson]

Hi,

Please review this patch to clean up the GC include dependencies in 
memoryPool.hpp.

The memoryPool.hpp header file uses GC specific code and has to include 
header and inline files for different Spaces and Generations. I propose 
that we decouple the memoryPool.hpp from the GC specific header files by 
moving the definition of the offending functions, and the includes, to 
memoryPool.cpp.

http://cr.openjdk.java.net/~stefank/8075416/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8075416

Tested with the java/lang/management jtreg testes.

Thanks,
StefanK