Sequential activity propagation should consider duty and activity on the clock pin

[hongted]

OpenSTA/power/Power.cc

Lines 836 to 838 in 9c9b565

	if (!hasUserActivity(out_pin)) {
	PwrActivity activity = evalActivity(seq->data(), reg);
	// Register output activity cannnot exceed one transition per clock cycle,

Is what propagates power for a sequential element. It only depends on data() and not clock() hence does not consider activity and/or duty on the clock pins.
Propagation should be updated to depend on both clocked_on and not just next_state functions for flops. A similar update may be needed for latches.

Extract from the .lib for a flop.

  ff (IQ,IQN) {
    clocked_on : "CLK"; 
    next_state : "D";
  } 

[hongted]

Duplicate of closed issue parallaxsw/OpenSTA#350