RFR(S): 8154452: Deferred cleanups after split of G1CollectorPolicy code

[Erik Helin]

On 2016-04-20, Mikael Gerdin wrote:
> Hi all,
> 
> Please review this small set of cleanups brought up during the review of
> 8154154.
> 
> I've decided to simply remove {is,as}_g1_policy since they had no callers
> and the code instead checks the UseG1GC flag to determine if G1 is running.
> 
> As Kim suggested, CollectorPolicy::post_heap_initialize does no useful work
> for neither G1 nor other collectors and I decided to remove it.
> Removing post_heap_initialize allowed me to remove its only caller,
> ColelctedHeap::post_initialize and I made that method pure virtual.
> 
> I also moved the setting of G1HeapRegionSize closer to where the actual
> value is computed. This allowed me to get rid of
> G1CollectorPolicy::initialize_flags, thus making G1CollectorPolicy implement
> a single pure virtual method, initialize_alignments().
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8154452
> Webrev: http://cr.openjdk.java.net/~mgerdin/8154452/webrev.0

Looks good, Reviewed.

Thanks,
Erik

> Testing: RBT GC Testing
> 
> /Mikael