Add integer casts to make v8 compile without warnings on 64-bit Visual Studio

src/heap.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1365 matching lines @@
     }
   }
 
   // Clear the cache.
   static void Clear();
 
   static const int kAbsent = -2;
  private:
   static int Hash(DescriptorArray* array, String* name) {
     // Uses only lower 32 bits if pointers are larger.
-    uintptr_t array_hash =
+    uint32_t array_hash =
         static_cast<uint32_t>(reinterpret_cast<uintptr_t>(array)) >> 2;
-    uintptr_t name_hash =
+    uint32_t name_hash =
         static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name)) >> 2;
     return (array_hash ^ name_hash) % kLength;
   }
 
   static const int kLength = 64;
   struct Key {
     DescriptorArray* array;
     String* name;
   };
 
@@ skipping 295 matching lines @@
 
   // To speed up scavenge collections new space string are kept
   // separate from old space strings.
   static List<Object*> new_space_strings_;
   static List<Object*> old_space_strings_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_