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Fix bug in mempool get_transaction_stats histogram calculation
The 98th percentile position in the agebytes map was incorrectly calculated: it assumed the transactions in the mempool all have unique timestamps at second-granularity. This commit fixes this by correctly finding the right cumulative number of transactions in the map suffix. This bug could lead to an out-of-bounds write in the rare case that all transactions in the mempool were received (and added to the mempool) at a rate of at least 50 transactions per second. (More specifically, the number of *unique* receive_time values, which have second- granularity, must be at most 2% of the number of transactions in the mempool for this crash to trigger.) If this condition is satisfied, 'it' points to *before* the agebytes map, 'delta' gets a nonsense value, and the value of 'i' in the first stats.histo-filling loop will be out of bounds of stats.histo.
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