feat(txpool): improve demotion unexecutable transactions #84
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Description
It improves the demotion of un-executable transactions in txpool, to increase the throughput of txpool.
Rationale
Demotion contributes a lot to the latency of the runReorg() procedure, with a portion of nearly 30% to 40%. And, it gets worse when the number of pending transactions grows, since every time the txpool demotes un-executable transactions, it iterator every transaction in the pool to decide whether to demote it or not.
Changes
Notable changes: