RFR: [9] 2018-02-27: Bulk backports to sh/jdk9

[Zhengyu Gu]

Okay.

-Zhengyu

On 02/27/2018 10:12 AM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk9-20180227/webrev.01/
> 
> This backports the all-important bug fixes to sh/jdk9:
> 
> d3dcc4565dcb: [backport] String dedup thread's poll() can interfere with scanning at safepoint
> 2a2fe8eff7cc: [backport] ReferenceProcessor is_alive setup is racy
> aea30526d0a4: [backport] Speed up asserts and verification, improve fastdebug builds performance
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
> 
>