Add support for aborts. (#2176)

Aborts are similar to exceptions except they are not caught by catch
and finally blocks. Callbacks should honor aborts as well and return
them without processing them. Aborts are never thrown by JavaScript
code.

In the future certain events such as out-of-memory condition may
also throw aborts.

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

jerry-core/api/jerry-snapshot.c

@@ -730,7 +730,7 @@ jerry_snapshot_result_at (const uint32_t *snapshot_p, /**< snapshot */
 
   if (ECMA_IS_VALUE_ERROR (ret_val))
   {
-    return ecma_create_error_reference (JERRY_CONTEXT (error_value));
+    return ecma_create_error_reference_from_context ();
   }
 
   return ret_val;