8025313: MetaspaceMemoryPool incorrectly reports undefined size for max Reviewed-by: stefank, tschatzl

8025605: G1: Heap expansion logging misleading for fully expanded heap Reviewed-by: tschatzl, jwilhelm, jmasa

8025441: G1: assert "assert(thread < _num_vtimes) failed: just checking" fails when G1ConcRefinementThreads > ParallelGCThreads Summary: The initialization for the remembered set summary data structures used the wrong thread count, i.e. number of worker threads instead of number of refinement threads. Reviewed-by: brutisso