Refactor object property chain to use property pairs. The patch

itself seems a step back, but the primary aim is opening future
optimization opportunities. The list of changes follows:

 - Property is changed to be an abstract type, which has type, flags,
   and a value. It does not have a name anymore and property pointers
   cannot be compressed.
 - Full (32 bit) ecma values can be property values. This allows
   using non-compressed pointers for ecma values in the future.
 - The property chain is not restricted to the same item anymore,
   it can contain hash maps, arrays in the future.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/ecma/operations/ecma-lex-env.c

@@ -331,7 +331,7 @@ ecma_op_delete_binding (ecma_object_t *lex_env_p, /**< lexical environment */
     }
     else
     {
-      JERRY_ASSERT (prop_p->flags & ECMA_PROPERTY_FLAG_NAMEDDATA);
+      JERRY_ASSERT (ECMA_PROPERTY_GET_TYPE (prop_p) == ECMA_PROPERTY_TYPE_NAMEDDATA);
 
       if (!ecma_is_property_configurable (prop_p))
       {