message: add cfg print option to alive-exec
diff: @@ -128,6 +128,10 @@ static llvm::cl::opt<string> opt_outputfile("o",
  llvm::cl::init(""), llvm::cl::cat(opt_alive),
  llvm::cl::desc("Specify output filename"));
  +static llvm::cl::opt<bool> opt_print_dot(
  + "dot", llvm::cl::desc("Print .dot file with CFG of each function"),
  + llvm::cl::init(false));
  +
  static llvm::ExitOnError ExitOnErr;
  // adapted from llvm-dis.cpp
  @@ -158,6 +162,14 @@ static void execFunction(llvm::Function &F, llvm::Triple &triple,
  ++errorCount;
  return;
  }
  + if (opt_print_dot) {
  + auto &f = *Func;
  + ofstream file(f.getName() + ".dot");
  + IR::CFG cfg(f);
  + cfg.printDot(file);
  + ofstream fileDom(f.getName() + ".dom.dot");
  + IR::DomTree(f, cfg).printDot(fileDom);
  + }
  Func->unroll(opt_unrolling_factor);
  Transform t;
  