Add missing NULL check to TypeFeedbackOracle::CompareTypes()

src/type-info.cc

 // Copyright 2012 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 338 matching lines @@
   *left_type = *right_type = *overall_type = *compare_nil_type =
       handle(Type::Any(), isolate_);
   Handle<Object> info = GetInfo(id);
   if (!info->IsCode()) return;
   Handle<Code> code = Handle<Code>::cast(info);
 
   Handle<Map> map;
   Map* raw_map = code->FindFirstMap();
   if (raw_map != NULL) {
     raw_map = raw_map->CurrentMapForDeprecated();
-    if (!CanRetainOtherContext(raw_map, *native_context_)) {
+    if (raw_map != NULL && !CanRetainOtherContext(raw_map, *native_context_)) {
       map = handle(raw_map, isolate_);
     }
   }
 
   if (code->is_compare_ic_stub()) {
     int stub_minor_key = code->stub_info();
     CompareIC::State left_state, right_state, handler_state;
     ICCompareStub::DecodeMinorKey(stub_minor_key, &left_state, &right_state,
                                   &handler_state, NULL);
     *left_type = CompareIC::StateToType(isolate_, left_state);
@@ skipping 343 matching lines @@
   USE(maybe_result);
 #ifdef DEBUG
   Object* result = NULL;
   // Dictionary has been allocated with sufficient size for all elements.
   ASSERT(maybe_result->ToObject(&result));
   ASSERT(*dictionary_ == result);
 #endif
 }
 
 } }  // namespace v8::internal