Using the same blocks in different sequence simulation may lead to issues

[dmatveev]

On 6b7f6f6:

| src op |

src := 'Src' asSeqBlock latency: 10 ms; live.
op := 'Op' asSeqBlock latency: 15 ms.

src >> op.

{
"Run normally"
SeqNaiveMultiExecutor new 
	add: (Sequence startingWith: src);
	runFor: 50 ms;
	trace.

"Run same blocks but in different sequence"
SeqNaiveMultiExecutor new
	add: (Sequence startingWith: src);
	runFor: 50 ms;
	trace.
}

Expected blocks have the same color (assigned to the same pipeline)

[dmatveev]

Also statistics is broken in this case.