[turbofan] Introduce a dedicated CheckMaps simplified operator.

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
 #define V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/deoptimize-reason.h"
@@ skipping 96 matching lines @@
                                          AccessMode access_mode);
 
   // Construct the appropriate subgraph for element access.
   ValueEffectControl BuildElementAccess(Node* receiver, Node* index,
                                         Node* value, Node* effect,
                                         Node* control,
                                         Handle<Context> native_context,
                                         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,
                               Handle<Context> native_context,
                               Handle<JSObject> holder);
 
   // Extract receiver maps from {nexus} and filter based on {receiver} if
   // possible.
   bool ExtractReceiverMaps(Node* receiver, Node* effect,
                            FeedbackNexus const& nexus,
@@ skipping 33 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(JSNativeContextSpecialization);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSNativeContextSpecialization::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_