Allow List::sort, with an integer comparison function, to sort 64-bit pointer...

src/profile-generator.cc

Index: src/profile-generator.cc
===================================================================
--- src/profile-generator.cc	(revision 5451)
+++ src/profile-generator.cc	(working copy)
@@ -2449,10 +2449,18 @@
 
 template<typename T>
 inline static int SortUsingEntryValue(const T* x, const T* y) {
-  return reinterpret_cast<intptr_t>((*x)->value) -
-      reinterpret_cast<intptr_t>((*y)->value);
+  uintptr_t x_uint = reinterpret_cast<uintptr_t>((*x)->value);
+  uintptr_t y_uint = reinterpret_cast<uintptr_t>((*y)->value);
+  if (x_uint > y_uint) {
+    return 1;
+  } else if (x_uint == y_uint) {
+    return 0;
+  } else {
+    return -1;
+  }
 }
 
+
 void HeapSnapshotJSONSerializer::SortHashMap(
     HashMap* map, List<HashMap::Entry*>* sorted_entries) {
   for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p))