[8] 2019-10-31, Bulk backports to sh/jdk8

[Roman Kennke]

Yes, go!

Thanks,
Roman


> https://cr.openjdk.java.net/~shade/shenandoah/backports/jdk8u-20191031/webrev.01/
> 
> Another batch of sh/jdk8 backports for early testing:
> 
>  [backport] 8225441: Cleanup ShenandoahHeap::atomic_compare_exchange_oop
>  [backport] 8232729: Shenandoah: assert ShenandoahHeap::cas_oop addresses are aligned
>  [backport] 8225514: Shenandoah: ShenandoahCodeRoots should inherit from AllStatic
>  [backport] 8225357: Rewire ShenandoahHeap::maybe_update_with_forwarded for contending fixups
>  [backport] 8232102: Shenandoah: print everything in proper units
>  [backport] 8229416: Shenandoah: Demote or remove ShenandoahOptimize*Final optimizations
>  [backport] 8229419: Shenandoah: Cleanup LRB strength selector code
> 
> Testing: {x86_32, x86_64} x {fastdebug,release} hotspot_gc_shenandoah
>