[aarch64-port-dev ] RFR: Fix new code for Shenandoah after the 8u171 merge

[Roman Kennke]

Looks good to me.

Thanks!
Roman


> Patch goes to:
>   http://hg.openjdk.java.net/aarch64-port/jdk8u-shenandoah/hotspot
> 
> The patch itself should be self-obvious:
> 
> # HG changeset patch
> # User shade
> # Date 1524641642 -7200
> #      Wed Apr 25 09:34:02 2018 +0200
> # Node ID eaa8479dd1580fb4adec2327b5dd367787543a8c
> # Parent  db8079be23d714b6ecca31a9f82136f1b29fe5d6
> Fix new code for Shenandoah after the 8u171 merge
> 
> diff -r db8079be23d7 -r eaa8479dd158 src/share/vm/prims/jvm.cpp
> --- a/src/share/vm/prims/jvm.cpp	Tue Apr 24 04:31:20 2018 +0100
> +++ b/src/share/vm/prims/jvm.cpp	Wed Apr 25 09:34:02 2018 +0200
> @@ -587,7 +587,7 @@
>    // If G1 is enabled then we need to register a non-null referent
>    // with the SATB barrier.
>  #if INCLUDE_ALL_GCS
> -  if (UseG1GC) {
> +  if (UseG1GC || UseShenandoahGC) {
>      oop referent = java_lang_ref_Reference::referent(clone);
>      if (referent != NULL) {
>        G1SATBCardTableModRefBS::enqueue(referent);
> @@ -595,7 +595,7 @@
>    }
>  #endif // INCLUDE_ALL_GCS
>    if ((java_lang_ref_Reference::next(clone) != NULL) ||
> -      (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) {
> +      (oopDesc::equals(java_lang_ref_Reference::queue(clone),
> java_lang_ref_ReferenceQueue::ENQUEUED_queue()))) {
>      // If the source has been enqueued or is being enqueued, don't
>      // register the clone with a queue.
>      java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue());
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
>