[libfuzzer] print_new_cov_pcs experimental option.

Differential Revision: http://reviews.llvm.org/D15901

llvm-svn: 256882
diff --git a/llvm/lib/Fuzzer/FuzzerInternal.h b/llvm/lib/Fuzzer/FuzzerInternal.h
index e96a4bc..17a2cae 100644
--- a/llvm/lib/Fuzzer/FuzzerInternal.h
+++ b/llvm/lib/Fuzzer/FuzzerInternal.h
@@ -97,6 +97,7 @@
     bool SaveArtifacts = true;
     bool PrintNEW = true;  // Print a status line when new units are found;
     bool OutputCSV = false;
+    bool PrintNewCovPcs = false;
   };
   Fuzzer(UserSuppliedFuzzer &USF, FuzzingOptions Options);
   void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
@@ -188,6 +189,7 @@
   long EpochOfLastReadOfOutputCorpus = 0;
   size_t LastRecordedBlockCoverage = 0;
   size_t LastRecordedCallerCalleeCoverage = 0;
+  size_t LastCoveragePcBufferLen = 0;
 };
 
 class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {