Make unique id to all scripts work with snapshot

src/heap.cc

 // Copyright 2006-2008 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 1220 matching lines @@
   // Allocate cache for single character strings.
   obj = AllocateFixedArray(String::kMaxAsciiCharCode+1);
   if (obj->IsFailure()) return false;
   single_character_string_cache_ = FixedArray::cast(obj);
 
   // Allocate cache for external strings pointing to native source code.
   obj = AllocateFixedArray(Natives::GetBuiltinsCount());
   if (obj->IsFailure()) return false;
   natives_source_cache_ = FixedArray::cast(obj);
 
+  // Handling of script id generation is in Factory::NewScript.
+  last_script_id_ = undefined_value();
+
   // Initialize keyed lookup cache.
   ClearKeyedLookupCache();
 
   // Initialize compilation cache.
   CompilationCache::Clear();
 
   return true;
 }
 
 
@@ skipping 2079 matching lines @@
 #ifdef DEBUG
 bool Heap::GarbageCollectionGreedyCheck() {
   ASSERT(FLAG_gc_greedy);
   if (Bootstrapper::IsActive()) return true;
   if (disallow_allocation_failure()) return true;
   return CollectGarbage(0, NEW_SPACE);
 }
 #endif
 
 } }  // namespace v8::internal