RFR [10] 2018-03-26: Bulk backports to sh/jdk10

[Zhengyu Gu]

Looks good to me.

-Zhengyu

On 03/26/2018 05:56 AM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk10-20180326/webrev.01/
> 
> This backports last week's work to sh/jdk10:
> 
> [backport] Elide Evac-OOM protocol when enqueuing string deduplication candidates in traversal GC
> [backport] Remove narrowOop variants of oopDesc::equals and related methods
> [backport] Keep track of per-cycle mutator/collector allocs. Fix mutator/collector alloc region
> overlap in traversal.
> [backport] Rename and cleanup _regions and _free_set uses
> [backport] Full GC should not trash empty regions
> [backport] Traversal should be reported as concurrent cycle in gc+stats
> [backport] Explicit concurrent GC should do traversal when Traversal GC is enabled
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>