X64: Fixups in heap-test.cc to make it compile in X64 mode.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index e35ac5fbaf35f95e78866a4ba20e1dbf8f7f5d16..4e924215b958c5fac318f232f457d2a9fc0e04b5 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -315,7 +315,7 @@ static bool WeakPointerCleared = false;
 static void TestWeakGlobalHandleCallback(v8::Persistent<v8::Value> handle,
                                          void* id) {
   USE(handle);
-  if (1234 == reinterpret_cast<int>(id)) WeakPointerCleared = true;
+  if (1234 == reinterpret_cast<intptr_t>(id)) WeakPointerCleared = true;
 }
 
 
@@ -385,7 +385,7 @@ TEST(WeakGlobalHandlesMark) {
 static void TestDeleteWeakGlobalHandleCallback(
     v8::Persistent<v8::Value> handle,
     void* id) {
-  if (1234 == reinterpret_cast<int>(id)) WeakPointerCleared = true;
+  if (1234 == reinterpret_cast<intptr_t>(id)) WeakPointerCleared = true;
   handle.Dispose();
 }