[turbofan] Further optimize spread/apply with arguments/rest parameters.

src/compiler/js-call-reducer.h

Index: src/compiler/js-call-reducer.h
diff --git a/src/compiler/js-call-reducer.h b/src/compiler/js-call-reducer.h
index 238ca77ab9b4a1b46d9db428580a1b2768ffdc52..cd04398fdd3f662ad57db100527e68df33c601f7 100644
--- a/src/compiler/js-call-reducer.h
+++ b/src/compiler/js-call-reducer.h
@@ -43,6 +43,10 @@ class JSCallReducer final : public AdvancedReducer {
 
   Reduction Reduce(Node* node) final;
 
+  // Processes the waitlist gathered while the reducer was running,
+  // and does a final attempt to reduce the nodes in the waitlist.
+  void Finalize() final;
+
  private:
   Reduction ReduceArrayConstructor(Node* node);
   Reduction ReduceBooleanConstructor(Node* node);
@@ -86,6 +90,7 @@ class JSCallReducer final : public AdvancedReducer {
   Flags const flags_;
   Handle<Context> const native_context_;
   CompilationDependencies* const dependencies_;
+  std::set<Node*> waitlist_;
 };
 
 }  // namespace compiler