Add a little more post morten debug info for the minidump.

src/heap.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 153 matching lines @@
     if (code_range_size_ > 0) {
       // Reserve no more than 1/8 of the memory for the code range.
       code_range_size_ = Min(code_range_size_, max_virtual >> 3);
     }
   }
 
   memset(roots_, 0, sizeof(roots_[0]) * kRootListLength);
   global_contexts_list_ = NULL;
   mark_compact_collector_.heap_ = this;
   external_string_table_.heap_ = this;
+  // Put a dummy entry in the remembered pages so we can find the list the
+  // minidump even if there are no real unmapped pages.
+  RememberUnmappedPage(NULL, false);
 }
 
 
 intptr_t Heap::Capacity() {
   if (!HasBeenSetUp()) return 0;
 
   return new_space_.Capacity() +
       old_pointer_space_->Capacity() +
       old_data_space_->Capacity() +
       code_space_->Capacity() +
@@ skipping 6945 matching lines @@
   } else {
     p ^= 0x1d1ed & (Page::kPageSize - 1);  // I died.
   }
   remembered_unmapped_pages_[remembered_unmapped_pages_index_] =
       reinterpret_cast<Address>(p);
   remembered_unmapped_pages_index_++;
   remembered_unmapped_pages_index_ %= kRememberedUnmappedPages;
 }
 
 } }  // namespace v8::internal