[Aditya30ag]

Problem

AflStatsStage wrote the total execution count into execs_per_sec, so fuzzer_stats and every plot_data row showed a number that only grows instead of throughput.

Fix

Keep the previous (time, executions) sample and report the rate between stats reports. The first report has no baseline and yields 0. Zero elapsed time and a counter that goes backwards also yield 0.

Testing

• Added a unit test for the rate calculation.
• Ran baby_fuzzer_unicode for 20s with stats_file/plot_file set:
  • before: execs_per_sec == execs_done (323253)
  • after: execs_per_sec ≈ 25k, matching 501813 execs / 20s

Checklist

• I have run ./scripts/precommit.sh and addressed all comments

[Aditya30ag]

@raaller sir and @domenukk sir please have alook