[turbofan] Introduce a dedicated CheckMaps simplified operator.

src/compiler/js-native-context-specialization.h

Index: src/compiler/js-native-context-specialization.h
diff --git a/src/compiler/js-native-context-specialization.h b/src/compiler/js-native-context-specialization.h
index a2ec02bce8b0e8ab6b4b05bb765bdbb78100713c..5405d1e5486aa2ba70bf40f8c22e8ff7887bf035 100644
--- a/src/compiler/js-native-context-specialization.h
+++ b/src/compiler/js-native-context-specialization.h
@@ -114,6 +114,13 @@ class JSNativeContextSpecialization final : public AdvancedReducer {
                                         ElementAccessInfo const& access_info,
                                         AccessMode access_mode);
 
+  // Construct an appropriate map check.
+  Node* BuildCheckMaps(Node* receiver, Node* effect, Node* control,
+                       std::vector<Handle<Map>> const& maps);
+
+  // Construct an appropriate heap object check.
+  Node* BuildCheckTaggedPointer(Node* receiver, Node* effect, Node* control);
+
   // Adds stability dependencies on all prototypes of every class in
   // {receiver_type} up to (and including) the {holder}.
   void AssumePrototypesStable(std::vector<Handle<Map>> const& receiver_maps,