get_loads_phase

Get loads of net with phase in the top level module, return the non-buffer/inverter leafs connections (LLM: loads with phase)
Usage: @result = get_loads_phase($net_or_pin, @options);
$net_or_pin: The net name or pin name that needs to get fanouts.
@options:
   -help: This information
@result: A two dimension array. Each item has format of 'instance', 'pin_name' and 'phase', if
         the load is leaf cell. Or 'port_name', 'GOF_PIN_IN' and 'phase' 
@result = ([instance_0, leaf_0, pin_0, 0],
           [instance_1, leaf_0, pin_1, 1],
           [port_name,  GOF_CELL_OUTPORT,GOF_PIN_IN, 1],
           ...
          )