8236073: G1: Use SoftMaxHeapSize to guide GC heuristics

*** 208,218 ****
        _dirty.clear_range(start_page, end_page);
      }
    } else {
      commit_internal(start_page, end_page);
    }
!   _committed.set_range(start_page, end_page);
  
    return zero_filled;
  }
  
  void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
--- 208,218 ----
        _dirty.clear_range(start_page, end_page);
      }
    } else {
      commit_internal(start_page, end_page);
    }
!   _committed.par_set_range(start_page, end_page, BitMap::unknown_range);
  
    return zero_filled;
  }
  
  void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
*** 233,243 ****
      _dirty.set_range(start_page, end_page);
    } else {
      uncommit_internal(start_page, end_page);
    }
  
!   _committed.clear_range(start_page, end_page);
  }
  
  class G1PretouchTask : public AbstractGangTask {
  private:
    char* volatile _cur_addr;
--- 233,243 ----
      _dirty.set_range(start_page, end_page);
    } else {
      uncommit_internal(start_page, end_page);
    }
  
!   _committed.par_clear_range(start_page, end_page, BitMap::unknown_range);
  }
  
  class G1PretouchTask : public AbstractGangTask {
  private:
    char* volatile _cur_addr;