Fix Type::Intersect to allocate large enough union.

src/types.h

 // Copyright 2013 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 382 matching lines @@
   }
   static Tag tagged_tag(Tagged* tagged) {
     return static_cast<Tag>(reinterpret_cast<intptr_t>(tagged->at(0)));
   }
   template<class T>
   static T tagged_get(Tagged* tagged, int i) {
     return reinterpret_cast<T>(tagged->at(i + 1));
   }
   template<class T>
   static void tagged_set(Tagged* tagged, int i, T value) {
-    tagged->at(i + 1) = reinterpret_cast<void*>(value);
+    tagged->Set(i + 1, reinterpret_cast<void*>(value));
   }
   static int tagged_length(Tagged* tagged) {
     return tagged->length() - 1;
   }
 
  public:
   typedef TypeImpl<ZoneTypeConfig> Type;
   class Base {};
   typedef i::ZoneList<Type*> Unioned;
   typedef i::Zone Region;
@@ skipping 226 matching lines @@
     return that.lower->Is(this->lower) && this->upper->Is(that.upper);
   }
 };
 
 typedef BoundsImpl<ZoneTypeConfig> Bounds;
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPES_H_