[libFuzzer] When printing NEW_FUNC, use 1-base indexing.

[alex]

Summary

Otherwise we print things like [0/1] which is visually confusing.

[kcc]

LGTM

[alex]

I'm not an llvm committer, what's the process for getting this landed from here?

[kcc]

what's the process for getting this landed from here?

Any other committer, typically the reviewer, could land this for you (I just did).
After some number of commits feel free to request commit access: https://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access

lib/fuzzer/FuzzerTracePC.cpp

if (NumInline8bitCounters == NumPCsInPCTables) {
         for (size_t j = 0; j < Size; j++, GuardIdx++)
           if (Counters()[GuardIdx])
             Observe(ModulePCTable[i].Start[j]);
       }
     }
   }
 
   for (size_t i = 0, N = Min(CoveredFuncs.size(), NumPrintNewFuncs); i < N; i++) {
-    Printf("\tNEW_FUNC[%zd/%zd]: ", i, CoveredFuncs.size());
+    Printf("\tNEW_FUNC[%zd/%zd]: ", i + 1, CoveredFuncs.size());
     PrintPC("%p %F %L\n", "%p\n", CoveredFuncs[i] + 1);
   }
 }
 
 inline ALWAYS_INLINE uintptr_t GetPreviousInstructionPc(uintptr_t PC) {
   // TODO: this implementation is x86 only.
   // see sanitizer_common GetPreviousInstructionPc for full implementation.
   return PC - 1;