src/share/vm/gc_implementation/g1/heapRegionManager.cpp

rev 6540 : 8054819: Rename HeapRegionSeq to HeapRegionManager
Reviewed-by: jwilhelm, jmasa
rev 6543 : 8056043: Heap does not shrink within the heap after JDK-8038423
Summary: Enable shrinking within the heap by removing some code added for JDK-8054818. Enable the test case that checks that again too.
Reviewed-by: jwilhelm, jmasa

*** 349,362 ****
    uint idx_last_found = 0;
    uint num_last_found = 0;
  
    while ((removed < num_regions_to_remove) &&
        (num_last_found = find_empty_from_idx_reverse(cur, &idx_last_found)) > 0) {
-     // Only allow uncommit from the end of the heap.
-     if ((idx_last_found + num_last_found) != _allocated_heapregions_length) {
-       return 0;
-     }
      uint to_remove = MIN2(num_regions_to_remove - removed, num_last_found);
  
      uncommit_regions(idx_last_found + num_last_found - to_remove, to_remove);
  
      cur -= num_last_found;
--- 349,358 ----