[lib/Fuzzer] on crash print the contents of the crashy input as base64

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236548 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Fuzzer/FuzzerIO.cpp

@@ -60,4 +60,9 @@ std::string DirPlusFile(const std::string &DirPath,
   return DirPath + "/" + FileName;
 }
 
+void PrintFileAsBase64(const std::string &Path) {
+  std::string Cmd = "base64 -w 0 < " + Path + "; echo";
+  system(Cmd.c_str());
+}
+
 }  // namespace fuzzer