1 files changed, 6 insertions, 2 deletions
diff --git a/deps/v8/src/compiler/graph-trimmer.h b/deps/v8/src/compiler/graph-trimmer.h
index d8258becc8..98d335a44d 100644
--- a/deps/v8/src/compiler/graph-trimmer.h
+++ b/deps/v8/src/compiler/graph-trimmer.h
@@ -28,14 +28,18 @@ class GraphTrimmer final {
   // or any of the roots in the sequence [{begin},{end}[.
   template <typename ForwardIterator>
   void TrimGraph(ForwardIterator begin, ForwardIterator end) {
-    while (begin != end) MarkAsLive(*begin++);
+    while (begin != end) {
+      Node* const node = *begin++;
+      if (!node->IsDead()) MarkAsLive(node);
+    }
     TrimGraph();
   }
 
  private:
   V8_INLINE bool IsLive(Node* const node) { return is_live_.Get(node); }
   V8_INLINE void MarkAsLive(Node* const node) {
-    if (!node->IsDead() && !IsLive(node)) {
+    DCHECK(!node->IsDead());
+    if (!IsLive(node)) {
       is_live_.Set(node, true);
       live_.push_back(node);
     }