RFR: [9] 2018-02-23, Bulk backports to sh/jdk9

[Zhengyu Gu]

Looks good to me.

-Zhengyu

On 02/23/2018 11:27 AM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk9-20180223/webrev.01/
> 
> This backports relevant bug and diagnostics fixes to sh/jdk9:
> 
> [backport] Refactor allocation seqnum handling: split mutator/GC allocs, merge with other metadata
> handling
> [backport] Denser ShHeapRegion status line
> [backport] Capture degenerated GC in hs_err status line
> [backport] Record Shenandoah events in hs_err events section
> [backport] Fixed code roots scanning that might be bypassed during degenerated cycle
> [backport] Consistent liveness for humongous regions
> [backport] RP closures should accept NULL referents
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>