RFR: ZGC: Make zGlobals and zArguments OS agnostic

[Erik Österlund]

Hi,

The contents of zGlobals and zArguments are cpu-specific, but not 
os_cpu-specific. Therefore, these files should be moved to be 
cpu-specific only.

Webrev:
http://cr.openjdk.java.net/~eosterlund/8230307/webrev.00/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8230307

Thanks,
/Erik