RFR: Clean up some platform dependent code in shared directories

[Per Liden]

Looks good!

/Per

On 2017-12-15 11:09, Stefan Karlsson wrote:
> Hi all,
>
> Please review this small patch to get rid of some define(linux) in
> shared code and fix places where clang complains. This patch makes it
> slightly easier to experiment with support for other platforms than
> Linux x64.
> http://cr.openjdk.java.net/~stefank/zgc/cleanup/webrev/open.changeset
>
> Thanks,
> StefanK