[serializer] fix hash function for hashmap used for serializing.

src/address-map.h

Index: src/address-map.h
diff --git a/src/address-map.h b/src/address-map.h
index 8fde35ef353a869ac3735b9fb99bdab3f03b91e5..d50847fcd46569ae7fe1e701fc5057b6a1de43dc 100644
--- a/src/address-map.h
+++ b/src/address-map.h
@@ -38,9 +38,7 @@ class PointerToIndexHashMap
     return reinterpret_cast<uintptr_t>(value);
   }
 
-  static uint32_t Hash(uintptr_t key) {
-    return static_cast<uint32_t>(key >> kPointerSizeLog2);
-  }
+  static uint32_t Hash(uintptr_t key) { return static_cast<uint32_t>(key); }
 };
 
 class AddressToIndexHashMap : public PointerToIndexHashMap<Address> {};