8040793: vmTestbase/nsk/monitoring/stress/lowmem fails on calling isCollectionUsageThresholdExceeded()

Backport-of: 0025764ec02bef391720962272b7219d34c00653

Author: TheRealMDoerr

src/hotspot/share/gc/serial/defNewGeneration.cpp

@@ -198,6 +198,10 @@ void DefNewGeneration::compute_space_boundaries(uintx minimum_eden_size,
   uintx size = _virtual_space.committed_size();
   uintx survivor_size = compute_survivor_size(size, SpaceAlignment);
   uintx eden_size = size - (2*survivor_size);
+  if (eden_size > max_eden_size()) {
+    eden_size = max_eden_size();
+    survivor_size = (size - eden_size)/2;
+  }
   assert(eden_size > 0 && survivor_size <= eden_size, "just checking");
 
   if (eden_size < minimum_eden_size) {