[libFuzzer] when using data-flow-trace (DFT) only load the DFT for the files present in the corpus

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@361579 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerDataFlowTrace.h b/FuzzerDataFlowTrace.h
index cfb04ad..022e854 100644
--- a/FuzzerDataFlowTrace.h
+++ b/FuzzerDataFlowTrace.h
@@ -32,6 +32,7 @@
 #include "FuzzerIO.h"
 
 #include <unordered_map>
+#include <unordered_set>
 #include <vector>
 #include <string>
 
@@ -112,7 +113,7 @@
  public:
   void ReadCoverage(const std::string &DirPath);
   bool Init(const std::string &DirPath, std::string *FocusFunction,
-            Random &Rand);
+            Vector<SizedFile> &CorporaFiles, Random &Rand);
   void Clear() { Traces.clear(); }
   const Vector<uint8_t> *Get(const std::string &InputSha1) const {
     auto It = Traces.find(InputSha1);
@@ -125,6 +126,7 @@
   // Input's sha1 => DFT for the FocusFunction.
   std::unordered_map<std::string, Vector<uint8_t> > Traces;
   BlockCoverage Coverage;
+  std::unordered_set<std::string> CorporaHashes;
 };
 }  // namespace fuzzer