Shenandoah heap regions checks verify that initial heap size covers at least 10 regions. This means the lowest uncommitted size is at least 10*RegionSize, which is a lot for large heaps. This seems to be the reminiscent of old resizing scheme, where Shenandoah could have run with "initial heap" for a long time, before GC code decided to resize. There is little sense it in now: Shenandoah would commit regions up to max_capacity if needed, including during the initial barrage of allocations. We should instead check that "max" heap size covers at least 10 regions.