RFR: Hide is_concurrent_traversal_in_progress check under the type check

[Zhengyu Gu]

Good to me.

-Zhengyu

On 04/06/2018 09:39 AM, Aleksey Shipilev wrote:
> http://cr.openjdk.java.net/~shade/shenandoah/alloc-hide-ha/webrev.01/
> 
> Micro-optimization: this avoid ShHeap field access on the usual path, instead checking on local
> variable.
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
>