RFR (sh/jdk8): Backport 2020-02-27, batch 2

[Aleksey Shipilev]

On 2/27/20 9:43 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/backport-shjdk8-2020-02-27-2/webrev.01/

Frankly, I suspect C1 rewiring (which also diverged from upstream) runs into the risk of
destabilizing sh/jdk8 before April CPU release. Can we delay it until July CPU opens?

I believe we should push the src/cpu/aarch64/vm/c1_LIRGenerator_aarch64.cpp change as the aarch64
addendum to this one: http://hg.openjdk.java.net/shenandoah/jdk8/hotspot/rev/cf0f69f962d9 -- ahead
of this backport batch.

Other things:

*) src/cpu/aarch64/vm/shenandoahBarrierSetAssembler_aarch64.cpp:
 Do you really need SBSC1 here?

 252   ShenandoahBarrierSetC1* bs = ShenandoahBarrierSetC1::bsc1();

-- 
Thanks,
-Aleksey