RFR [11]: 2018-10-01, Bulk backports to sh/jdk11

[Roman Kennke]

This looks good to me.
Thanks, Roman


> http://cr.openjdk.java.net/~shade/shenandoah/backports/jdk11-20181001/webrev.01/
> 
> This backports recent work to sh/jdk11:
> 
>  [backport] Suppressing VSC++ warning locally
>  [backport] Handle update_refs, class_unload, ref_proc in ShConcMark better
>  [backport] Common liveness cache in ShHeap
>  [backport] Inline/rename confusingly named methods in ShConcurrentMark
>  [backport] Sort ShenandoahConcurrentMark methods/fields into logical groups
>  [backport] Prepare tests for making UseShenandoahGC experimental
>  [backport] Fix inconsistent "process weakrefs" logging
>  [backport] Several AArch64 cleanups
>  [backport] Trim down oop-equals verification
>  [backport] Remove ShFastSyncRoots
>  [backport] Remove ShWB from formssel.cpp
>  [backport] Purge flat profiler GC timing entries
>  [backport] Use s-macro to keep GC phase enum and names in sync
>  [backport] Remaining x86 assembler cleanup
>  [backport] More AArch64 assembler cleanups
>  [backport] Refactor runtime allocation to avoid code duplication and upstream diff
>  [backport] Renaming ShenandoahParallelEvacuationTask to ShenandoahConcurrentEvacuationTask
> 
> Testing: tier3_gc_shenandoah {fastdebug|release}
> 
> Thanks,
> -Aleksey
>