[turbofan] Add support for advanced reducers.

src/compiler/node-marker.cc

Index: src/compiler/node-marker.cc
diff --git a/src/compiler/node-marker.cc b/src/compiler/node-marker.cc
index 4bf12f9751b62f89cbc65d6f585690a26a5f94b9..fb7c1e192abb64ccb293d2cef67471cf18335471 100644
--- a/src/compiler/node-marker.cc
+++ b/src/compiler/node-marker.cc
@@ -13,8 +13,8 @@ namespace compiler {
 
 NodeMarkerBase::NodeMarkerBase(Graph* graph, uint32_t num_states)
     : mark_min_(graph->mark_max_), mark_max_(graph->mark_max_ += num_states) {
-  DCHECK(num_states > 0);         // user error!
-  DCHECK(mark_max_ > mark_min_);  // check for wraparound.
+  DCHECK_NE(0u, num_states);        // user error!
+  DCHECK_LT(mark_min_, mark_max_);  // check for wraparound.
 }
 
 
@@ -35,6 +35,14 @@ void NodeMarkerBase::Set(Node* node, Mark mark) {
   node->set_mark(mark + mark_min_);
 }
 
+
+void NodeMarkerBase::Reset(Graph* graph) {
+  uint32_t const num_states = mark_max_ - mark_min_;
+  mark_min_ = graph->mark_max_;
+  mark_max_ = graph->mark_max_ += num_states;
+  DCHECK_LT(mark_min_, mark_max_);  // check for wraparound.
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8