RFR [10], 2018-08-24, Bulk backports to sh/jdk10

[Roman Kennke]

Am 24.08.2018 um 19:35 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk10-20180824/webrev.01/
> 
> This backports recent work to sh/jdk10:
> 
>  [backport] Comprehensible GC trigger logging
>  [backport] Fix ShHeap::notify_alloc usages: it accepts words, not bytes
>  [backport] Adaptive/Traversal heuristics rewrite for allocation rate
>  [backport] Enhancement on traversal code root scanning
>  [backport] Remove ShHeuristics::print_threshold
>  [backport] Avoid using uintx in ShenandoahHeapRegion
>  [backport] shenandoah_assert_correct should check object/forwardee klasses
>  [backport] Evac assist should touch marked objects only
> 
> Testing: tier3_gc_shenandoah {fastdebug|release}
> 

Looks good! Thanks!
Roman