[WIP] Start adding JSCallWithVarargs

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 b9a595751ccec5c5efde9482684524a9c445c6a0..6a1f0d8fcc227e096119f3177b71e47e3ce1849e 100644
--- a/src/compiler/js-call-reducer.h
+++ b/src/compiler/js-call-reducer.h
@@ -38,6 +38,10 @@ 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);
@@ -79,6 +83,7 @@ class JSCallReducer final : public AdvancedReducer {
   JSGraph* const jsgraph_;
   Handle<Context> const native_context_;
   CompilationDependencies* const dependencies_;
+  std::set<Node*> waitlist_;
 };
 
 }  // namespace compiler