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Race condition #574

@anishnaik

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@anishnaik
⇾ fuzz: elapsed: 3h28m51s, calls: 133899778 (10093/sec), seq/s: 202, coverage: 56672, corpus: 7366, failures: 0/2677987, gas/s: 2848859895
⇾ fuzz: elapsed: 3h28m54s, calls: 133930623 (10281/sec), seq/s: 205, coverage: 56672, corpus: 7368, failures: 0/2678604, gas/s: 2853501086
⇾ fuzz: elapsed: 3h28m57s, calls: 133959125 (9499/sec), seq/s: 189, coverage: 56672, corpus: 7370, failures: 0/2679173, gas/s: 2767342178
⇾ fuzz: elapsed: 3h29m0s, calls: 133988580 (9818/sec), seq/s: 196, coverage: 56672, corpus: 7372, failures: 0/2679762, gas/s: 3025943265
⇾ fuzz: elapsed: 3h29m3s, calls: 134018838 (10071/sec), seq/s: 201, coverage: 56672, corpus: 7374, failures: 0/2680367, gas/s: 2950879143
fatal error: concurrent map iteration and map write

goroutine 418 [running]:
github.com/crytic/medusa/fuzzing/coverage.(*CoverageMaps).UniquePCs(...)
        /home/runner/work/medusa/medusa/fuzzing/coverage/coverage_maps.go:252
github.com/crytic/medusa/fuzzing.(*Fuzzer).printMetricsLoop(0xc0003fd888)
        /home/runner/work/medusa/medusa/fuzzing/fuzzer.go:976 +0x1a47
created by github.com/crytic/medusa/fuzzing.(*Fuzzer).Start in goroutine 1
        /home/runner/work/medusa/medusa/fuzzing/fuzzer.go:833 +0xe25

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