[turbofan] Prevent storing signalling NaNs into holey double arrays.

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 824 matching lines @@
         this_value = graph()->NewNode(simplified()->TypeGuard(type_cache_.kSmi),
                                       this_value, this_control);
       } else if (IsFastDoubleElementsKind(elements_kind)) {
         Node* check =
             graph()->NewNode(simplified()->ObjectIsNumber(), this_value);
         this_control = this_effect =
             graph()->NewNode(common()->DeoptimizeUnless(), check, frame_state,
                              this_effect, this_control);
         this_value = graph()->NewNode(simplified()->TypeGuard(Type::Number()),
                                       this_value, this_control);
+        // Make sure we do not store signalling NaNs into holey double arrays.
+        if (elements_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
+          this_value =
+              graph()->NewNode(simplified()->NumberSilenceNaN(), this_value);
+        }
       }
       this_effect = graph()->NewNode(simplified()->StoreElement(element_access),
                                      this_elements, this_index, this_value,
                                      this_effect, this_control);
     }
 
     // Remember the final state for this element access.
     values.push_back(this_value);
     effects.push_back(this_effect);
     controls.push_back(this_control);
@@ skipping 274 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSNativeContextSpecialization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8