RFR [11], 2018-08-21, Bulk backports to sh/jdk11

[Zhengyu Gu]

Looks good.

Just one question, are we going to enable -Wreorder or just for ease of 
future backports?

Thanks,

-Zhengyu

On 08/21/2018 07:27 AM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk11-20180821/webrev.01/
> 
> This backports recent work to sh/jdk11:
> 
>   [backport] Make weakref processing always use Executor
>   [backport] Split write barrier paths for mutator and GC workers
>   [backport] Fix bad assertion: can see non-empty task queue during canceled GC cycle
>   [backport] clean up obsolete c2 code
>   [backport] WB slowpath should assist with evacuation of adjacent objects
>   [backport] Report heap region stats in proper units
>   [backport] Shenandoah changes to allow enabling -Wreorder
>   [backport] Report Traversal status in heap sampling
>   [backport] Convert magic value to ShenandoahPacingSurcharge
>   [backport] Improve Traversal CSet logging
>   [backport] Adaptive CSet selection for Traversal
>   [backport] Trivial enhancement to avoid costly deletion array element
>   [backport] Restore stricter assertions in c1_LIR_x86.cpp
>   [backport] Traversal needs to enqueue evacuated oops in codecahe
> 
> Testing: tier3_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>