[turbofan] Fix overly aggressive keyed access lowering.

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 47 matching lines @@
   Reduction ReduceJSLoadNamed(Node* node);
   Reduction ReduceJSStoreNamed(Node* node);
   Reduction ReduceJSLoadProperty(Node* node);
   Reduction ReduceJSStoreProperty(Node* node);
 
   Reduction ReduceElementAccess(Node* node, Node* index, Node* value,
                                 MapHandleList const& receiver_maps,
                                 AccessMode access_mode,
                                 LanguageMode language_mode,
                                 KeyedAccessStoreMode store_mode);
+  template <typename KeyedICNexus>
   Reduction ReduceKeyedAccess(Node* node, Node* index, Node* value,
-                              FeedbackNexus const& nexus,
-                              AccessMode access_mode,
+                              KeyedICNexus const& nexus, AccessMode access_mode,
                               LanguageMode language_mode,
                               KeyedAccessStoreMode store_mode);
   Reduction ReduceNamedAccess(Node* node, Node* value,
                               FeedbackNexus const& nexus, Handle<Name> name,
                               AccessMode access_mode,
                               LanguageMode language_mode);
   Reduction ReduceNamedAccess(Node* node, Node* value,
                               MapHandleList const& receiver_maps,
                               Handle<Name> name, AccessMode access_mode,
                               LanguageMode language_mode,
@@ skipping 79 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_