RFR(s): 8198369: Clean up GCId and GCIdMark

[Stefan Karlsson]

Looks good.

StefanK

On 2018-02-19 14:38, Per Liden wrote:
> After discussing "8198267: Allow GCId::current_raw() calls from 
> non-NamedThreads", we noticed the need to do some additional cleanups of 
> GCId and GCIdMark. So here's a patch for that.
> 
> In short, GCIdMarkAndRestore is not really needed, we can let the normal 
> GCIdMark have the restore semantics and get rid of GCIdMarkAndRestore. 
> GCId and GCIdMark can also be cleaned up a bit, for example. the 
> GCIdMark::_gc_id member is unnecessary, some functions return "const 
> uint" instead of "uint", etc.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8198369
> Webrev: http://cr.openjdk.java.net/~pliden/8198369/webrev.0/
> 
> /Per
>