[libFuzzer] add stats to the corpus; more refactoring

llvm-svn: 282121
diff --git a/llvm/lib/Fuzzer/FuzzerOptions.h b/llvm/lib/Fuzzer/FuzzerOptions.h
index fc8141c..2c09706 100644
--- a/llvm/lib/Fuzzer/FuzzerOptions.h
+++ b/llvm/lib/Fuzzer/FuzzerOptions.h
@@ -45,6 +45,7 @@
   bool OutputCSV = false;
   bool PrintNewCovPcs = false;
   bool PrintFinalStats = false;
+  bool PrintCorpusStats = false;
   bool PrintCoverage = false;
   bool DetectLeaks = true;
   bool PruneCorpus = true;