[objects] seed NumberDictionary (only ia32 now)

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index 68b1517de4b822399d8d34c003084d1482f091eb..17bf06ffa3cb5677b81c37640738b4e7517cf1d8 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -252,10 +252,13 @@ class BitField {
 // ----------------------------------------------------------------------------
 // Hash function.
 
+static const uint32_t kZeroHashSeed = 0;
+
 // Thomas Wang, Integer Hash Functions.
 // http://www.concentric.net/~Ttwang/tech/inthash.htm
-inline uint32_t ComputeIntegerHash(uint32_t key) {
+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);
@@ -280,7 +283,8 @@ inline uint32_t ComputeLongHash(uint64_t key) {
 
 inline uint32_t ComputePointerHash(void* ptr) {
   return ComputeIntegerHash(
-      static_cast<uint32_t>(reinterpret_cast<intptr_t>(ptr)));
+      static_cast<uint32_t>(reinterpret_cast<intptr_t>(ptr)),
+      v8::internal::kZeroHashSeed);
 }