6898857: [Regression] -XX:NewRatio with -XX:+UseConcMarkSweepGC causes fatal error

Summary: Use CollectorPolicy information instead of MaxNewSize
Reviewed-by: ysr, jcoomes

src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp

@@ -709,7 +709,8 @@ CMSCollector::CMSCollector(ConcurrentMarkSweepGeneration* cmsGen,
 
   // Support for parallelizing survivor space rescan
   if (CMSParallelRemarkEnabled && CMSParallelSurvivorRemarkEnabled) {
-    size_t max_plab_samples = MaxNewSize/((SurvivorRatio+2)*MinTLABSize);
+    size_t max_plab_samples = cp->max_gen0_size()/
+                                ((SurvivorRatio+2)*MinTLABSize);
     _survivor_plab_array  = NEW_C_HEAP_ARRAY(ChunkArray, ParallelGCThreads);
     _survivor_chunk_array = NEW_C_HEAP_ARRAY(HeapWord*, 2*max_plab_samples);
     _cursor               = NEW_C_HEAP_ARRAY(size_t, ParallelGCThreads);