RFR 8227635: Shenandoah: SHBSA::load_at() needs to deal IN_NATIVE load

[Zhengyu Gu]

Please review this updated webrev:

http://cr.openjdk.java.net/~zgu/JDK-8227635/webrev.01/


1) As Roland suggested, don't save vector registers.

2) Renamed oop_load_natiev_barrier() to load_reference_barrier_native() 
to be consistent with current Roman's naming changes.

3) Use is_traversal_mode() instead of 
is_concurrent_traversal_in_progress(), due to recent traversal GC changes.

4) Restore old traversal behavior, disregard NO_KEEPALIVE decorator.

Test:

   hotspot_gc_shenandoah (fastdebug and release) on Linux x86_64 and 
aarch64.


-Zhengyu



On 7/15/19 3:17 AM, Roland Westrelin wrote:
> 
>> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8227635/webrev.00/index.html
> 
> Do you really need to save vector registers? Isn't this called from the
> interpreter only?
> 
> Roland.
>