8190426: Lazily initialize refinement threads with UseDynamicNumberOfGCThreads Reviewed-by: sangheki, sjohanss

8182050: assert(_whole_heap.contains(p)) failed: Attempt to access p out of bounds of card marking array's _whole_heap Summary: Ignore zero-sized MemRegions to invalidate in G1SATBCardTableLoggingModRefBS::invalidate() Reviewed-by: ehelin, sjohanss

8179244: Assert failed in instanceMirrorKlass.inline.hpp Summary: Investigate the failure and upon observing that the assert is too strict, disable it and addd a comment. Reviewed-by: ehelin

8189733: Cleanup Full GC setup and tear down Reviewed-by: tschatzl, ehelin

Merge

8191653: Test failures in BootAppendTests - missing jdk.internal.vm.compiler module Summary: backout the fix for 8190975 Reviewed-by: iklam, kvn

8187280: Remove unused methods from StubQueue Reviewed-by: kvn, kbarrett

8191768: Introduce a concurrency factor to be able to scale up or down jtreg concurrency when running Hotspot tests Reviewed-by: erikj

8191688: Assert failed in > 200 tests: failed dependencies, but counter didn't change Reviewed-by: kvn

8189793: [s390]: Improve String compress/inflate by exploiting vector instructions Reviewed-by: mdoerr, goetz