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/base/ecma-alloc.h

@@ -37,18 +37,6 @@ extern ecma_object_t *ecma_alloc_object (void);
  */
 extern void ecma_dealloc_object (ecma_object_t *);
 
-/**
- * Allocate memory for ecma-property
- *
- * @return pointer to allocated memory
- */
-extern ecma_property_t *ecma_alloc_property (void);
-
-/**
- * Dealloc memory from an ecma-property
- */
-extern void ecma_dealloc_property (ecma_property_t *);
-
 /**
  * Allocate memory for ecma-number
  *
@@ -121,6 +109,18 @@ extern ecma_external_pointer_t *ecma_alloc_external_pointer (void);
 */
 extern void ecma_dealloc_external_pointer (ecma_external_pointer_t *);
 
+/**
+ * Allocate memory for ecma-property pair
+ *
+ * @return pointer to allocated memory
+ */
+extern ecma_property_pair_t *ecma_alloc_property_pair (void);
+
+/**
+ * Dealloc memory from an ecma-property pair
+ */
+extern void ecma_dealloc_property_pair (ecma_property_pair_t *);
+
 /**
  * @}
  * @}