Fix missing guard

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

 // 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.
 
 #include "src/compiler/js-native-context-specialization.h"
 
 #include "src/accessors.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
@@ skipping 305 matching lines @@
             field_access.machine_type = MachineType::Float64();
           }
         } else if (field_type->Is(Type::TaggedSigned())) {
           Node* check =
               graph()->NewNode(simplified()->ObjectIsSmi(), this_value);
           Node* branch = graph()->NewNode(common()->Branch(BranchHint::kTrue),
                                           check, this_control);
           exit_controls.push_back(
               graph()->NewNode(common()->IfFalse(), branch));
           this_control = graph()->NewNode(common()->IfTrue(), branch);
+          this_value = graph()->NewNode(common()->Guard(type_cache_.kSmi),
+                                        this_value, this_control);
         } else if (field_type->Is(Type::TaggedPointer())) {
           Node* check =
               graph()->NewNode(simplified()->ObjectIsSmi(), this_value);
           Node* branch = graph()->NewNode(common()->Branch(BranchHint::kFalse),
                                           check, this_control);
           exit_controls.push_back(graph()->NewNode(common()->IfTrue(), branch));
           this_control = graph()->NewNode(common()->IfFalse(), branch);
           if (field_type->NumClasses() > 0) {
             // Emit a (sequence of) map checks for the value.
             ZoneVector<Node*> this_controls(zone());
@@ skipping 459 matching lines @@
         }
       }
     } else {
       DCHECK_EQ(AccessMode::kStore, access_mode);
       if (IsFastSmiElementsKind(elements_kind)) {
         Node* check = graph()->NewNode(simplified()->ObjectIsSmi(), this_value);
         Node* branch = graph()->NewNode(common()->Branch(BranchHint::kTrue),
                                         check, this_control);
         exit_controls.push_back(graph()->NewNode(common()->IfFalse(), branch));
         this_control = graph()->NewNode(common()->IfTrue(), branch);
+        this_value = graph()->NewNode(common()->Guard(type_cache_.kSmi),
+                                      this_value, this_control);
       } else if (IsFastDoubleElementsKind(elements_kind)) {
         Node* check =
             graph()->NewNode(simplified()->ObjectIsNumber(), this_value);
         Node* branch = graph()->NewNode(common()->Branch(BranchHint::kTrue),
                                         check, this_control);
         exit_controls.push_back(graph()->NewNode(common()->IfFalse(), branch));
         this_control = graph()->NewNode(common()->IfTrue(), branch);
         this_value = graph()->NewNode(common()->Guard(Type::Number()),
                                       this_value, this_control);
       }
@@ skipping 205 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSNativeContextSpecialization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8