RFR: Backport recent changes to shenandoah/jdk11

[Aleksey Shipilev]

On 8/1/19 9:08 PM, Roman Kennke wrote:
> I integrated your changes, and (trivially) re-based to 11.0.5:
> 
> http://cr.openjdk.java.net/~rkennke/backport-jdk11-2019-07-31/webrev.01/

Cool. Add new line here in x86_32.ad:

7544   ins_pipe( pipe_cmpxchg );
7545 %}
7546 instruct xaddB_no_res( memory mem, Universe dummy, immI add, eFlagsReg cr) %{

This whole thing passes hotspot_gc_shenandoah on x86_32 and x86_64 for me.

-- 
Thanks,
-Aleksey