RFR [9] 2018-02-01: Bulk backports to sh/jdk9

[Aleksey Shipilev]

Ping.

-Aleksey

On 01/31/2018 06:37 PM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk9-20180201/webrev.01/
> 
> This backports the follow-up bugfixes we have recently found to sh/jdk9:
> 
> 16198c705496: [backport] Conditionalize PerfDataMemorySize on enabled heap sampling
> dd1b2cd3c66e: [backport] Make major GC phases exclusive from each other
> 4050463704a4: [backport] Single GCTimer shared by all operations
> af9272163588: [backport] fix -ShenandoahWriteBarrierMemBar and loop unswitching
> 
> sh/jdk10 nightly is running with them now to verify separately.
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>