[lib/Fuzzer] when -sync_command=<CMD> is given, periodically execute 'CMD CORPUS' to synchronize with other processes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237617 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Fuzzer/FuzzerUtil.cpp

@@ -70,4 +70,8 @@ int NumberOfCpuCores() {
   return N;
 }
 
+void ExecuteCommand(const std::string &Command) {
+  system(Command.c_str());
+}
+
 }  // namespace fuzzer