Fix SafePrettyTypeOf to never call VerifyObject.

Calling VerifyObject from the segfault handler caused another
segfault.

Change-Id: I459646594d830cbb110a4ac2bac25a7b90794854
diff --git a/runtime/gc/accounting/card_table-inl.h b/runtime/gc/accounting/card_table-inl.h
index 841f4ae..564168e 100644
--- a/runtime/gc/accounting/card_table-inl.h
+++ b/runtime/gc/accounting/card_table-inl.h
@@ -154,6 +154,7 @@
   // Now we have the words, we can process words in parallel.
   uintptr_t* word_cur = reinterpret_cast<uintptr_t*>(card_cur);
   uintptr_t* word_end = reinterpret_cast<uintptr_t*>(card_end);
+  // TODO: This is not big endian safe.
   union {
     uintptr_t expected_word;
     uint8_t expected_bytes[sizeof(uintptr_t)];