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

[Aleksey Shipilev]

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