RFR: [9] Bulk backports to sh/jdk9

[Roman Kennke]

Am 07.12.2017 um 18:16 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk9-20171207/webrev.01/
> 
> This backports current work to make AArch64 perform well.
> 
> [backport] Check BS type in immByteMapBase predicate
> [backport] Optimize oop/fwdptr/hr_index verification a bit
> [backport] Optimize fwdptr region handling in ShenandoahVerifyOopClosure::verify_oop
> [backport] SieveObjects test is too hostile to verification
> 
> Testing: hotspot_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
> 

Patches look good.
I built it on aarch64. All green.

Roman