Revert "[libFuzzer] Mutation tracking and logging implemented"

This reverts r336597 due to bot breakage.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@336616 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerMutate.h b/FuzzerMutate.h
index 3216522..996d756 100644
--- a/FuzzerMutate.h
+++ b/FuzzerMutate.h
@@ -86,11 +86,8 @@
 
   Random &GetRand() { return Rand; }
 
-  void PrintMutationStats();
-
-  void RecordUsefulMutations();
-
 private:
+
   struct Mutator {
     size_t (MutationDispatcher::*Fn)(uint8_t *Data, size_t Size, size_t Max);
     const char *Name;
@@ -131,8 +128,8 @@
   // entries that led to successful discoveries in the past mutations.
   Dictionary PersistentAutoDictionary;
 
+  Vector<Mutator> CurrentMutatorSequence;
   Vector<DictionaryEntry *> CurrentDictionaryEntrySequence;
-  Vector<size_t> CurrentMutatorIdxSequence;
 
   static const size_t kCmpDictionaryEntriesDequeSize = 16;
   DictionaryEntry CmpDictionaryEntriesDeque[kCmpDictionaryEntriesDequeSize];
@@ -146,11 +143,6 @@
 
   Vector<Mutator> Mutators;
   Vector<Mutator> DefaultMutators;
-
-  // A total count of each mutation used in the fuzzing process.
-  Vector<uint64_t> TotalMutations;
-  // The number of each mutation that resulted in new coverage.
-  Vector<uint64_t> UsefulMutations;
 };
 
 }  // namespace fuzzer