compile.cpp verify_graph_edges uses "bool" as "int"

instead of:

void Compile::verify_graph_edges(bool no_dead_code) {
  if (VerifyGraphEdges) {
    ResourceArea *area = Thread::current()->resource_area();
    Unique_Node_List visited(area);
    // Call recursive graph walk to check edges
    _root->verify_edges(visited);
    if (no_dead_code) {
      // Now make sure that no visited node is used by an unvisited node.
      bool dead_nodes = 0;
      Unique_Node_List checked(area);
      while (visited.size() > 0) {
        Node* n = visited.pop();
        checked.push(n);
        for (uint i = 0; i < n->outcnt(); i++) {
          Node* use = n->raw_out(i);
          if (checked.member(use))  continue;  // already checked
          if (visited.member(use))  continue;  // already in the graph
          if (use->is_Con())        continue;  // a dead ConNode is OK
          // At this point, we have found a dead node which is DU-reachable.
          if (dead_nodes++ == 0)
            tty->print_cr("*** Dead nodes reachable via DU edges:");
          use->dump(2);
          tty->print_cr("---");
          checked.push(use);  // No repeats; pretend it is now checked.
        }
      }
      assert(dead_nodes == 0, "using nodes must be reachable from root");
    }
  }
}

should be:

void Compile::verify_graph_edges(bool no_dead_code) {
  if (VerifyGraphEdges) {
    ResourceArea *area = Thread::current()->resource_area();
    Unique_Node_List visited(area);
    // Call recursive graph walk to check edges
    _root->verify_edges(visited);
    if (no_dead_code) {
      // Now make sure that no visited node is used by an unvisited node.
      int dead_nodes = 0;
      Unique_Node_List checked(area);
      while (visited.size() > 0) {
        Node* n = visited.pop();
        checked.push(n);
        for (uint i = 0; i < n->outcnt(); i++) {
          Node* use = n->raw_out(i);
          if (checked.member(use))  continue;  // already checked
          if (visited.member(use))  continue;  // already in the graph
          if (use->is_Con())        continue;  // a dead ConNode is OK
          // At this point, we have found a dead node which is DU-reachable.
          if (dead_nodes++ == 0)
            tty->print_cr("*** Dead nodes reachable via DU edges:");
          use->dump(2);
          tty->print_cr("---");
          checked.push(use);  // No repeats; pretend it is now checked.
        }
      }
      assert(dead_nodes == 0, "using nodes must be reachable from root");
    }
  }
}