Reload the map of typed arrays after performing ToNumber.

src/objects.cc

 // Copyright 2013 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 <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 3274 matching lines @@
   if (is_observed) maybe_old = it->GetDataValue();
 
   Handle<Object> to_assign = value;
   // Convert the incoming value to a number for storing into typed arrays.
   if (it->IsElement() && (receiver->HasExternalArrayElements() ||
                           receiver->HasFixedTypedArrayElements())) {
     if (!value->IsNumber() && !value->IsUndefined()) {
       ASSIGN_RETURN_ON_EXCEPTION(it->isolate(), to_assign,
                                  Execution::ToNumber(it->isolate(), value),
                                  Object);
+      // ToNumber above might modify the receiver, causing the cached
+      // holder_map to mismatch the actual holder->map() after this point.
+      // Reload the map to be in consistent state. Other cached state cannot
+      // have been invalidated since typed array elements cannot be reconfigured
+      // in any way.
+      it->ReloadHolderMap();
     }
   }
 
   // Possibly migrate to the most up-to-date map that will be able to store
   // |value| under it->name().
   it->PrepareForDataProperty(to_assign);
 
   // Write the property value.
   it->WriteDataValue(to_assign);
 
@@ skipping 12821 matching lines @@
                                             Handle<Object> new_value) {
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 }  // namespace internal
 }  // namespace v8