[builtins] HasOwnProperty: handle non-internalized string keys

src/utils.h

 // Copyright 2012 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_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 295 matching lines @@
   static const U kOne = static_cast<U>(1U);
   static const U kMask = ((kOne << shift) << size) - (kOne << shift);
   static const U kShift = shift;
   static const U kSize = size;
   static const U kNext = kShift + kSize;
 
   // Value for the field with all bits set.
   static const T kMax = static_cast<T>((kOne << size) - 1);
 
   // Tells whether the provided value fits into the bit field.
-  static bool is_valid(T value) {
+  static constexpr bool is_valid(T value) {
     return (static_cast<U>(value) & ~static_cast<U>(kMax)) == 0;
   }
 
   // Returns a type U with the bit field value encoded.
   static U encode(T value) {
     DCHECK(is_valid(value));
     return static_cast<U>(value) << shift;
   }
 
   // Returns a type U with the bit field value updated.
@@ skipping 1395 matching lines @@
  private:
   T value_;
   ThreadedListZoneEntry<T>* next_;
   DISALLOW_COPY_AND_ASSIGN(ThreadedListZoneEntry);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_