Move hash code from hidden string to a private symbol

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 322 matching lines @@
 // http://www.concentric.net/~Ttwang/tech/inthash.htm
 inline uint32_t ComputeIntegerHash(uint32_t key, uint32_t seed) {
   uint32_t hash = key;
   hash = hash ^ seed;
   hash = ~hash + (hash << 15);  // hash = (hash << 15) - hash - 1;
   hash = hash ^ (hash >> 12);
   hash = hash + (hash << 2);
   hash = hash ^ (hash >> 4);
   hash = hash * 2057;  // hash = (hash + (hash << 3)) + (hash << 11);
   hash = hash ^ (hash >> 16);
-  return hash;
+  return hash & 0x3fffffff;
 }
 
 
 inline uint32_t ComputeLongHash(uint64_t key) {
   uint64_t hash = key;
   hash = ~hash + (hash << 18);  // hash = (hash << 18) - hash - 1;
   hash = hash ^ (hash >> 31);
   hash = hash * 21;  // hash = (hash + (hash << 2)) + (hash << 4);
   hash = hash ^ (hash >> 11);
   hash = hash + (hash << 6);
@@ skipping 1351 matching lines @@
   // Takes the address of the limit variable in order to find out where
   // the top of stack is right now.
   uintptr_t limit = reinterpret_cast<uintptr_t>(&limit);
   return limit;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_