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/jcontext/jcontext.h

@@ -84,13 +84,11 @@ typedef struct
   ecma_value_t error_value; /**< currently thrown error value */
   uint32_t lit_magic_string_ex_count; /**< external magic strings count */
   uint32_t jerry_init_flags; /**< run-time configuration flags */
-  uint8_t is_direct_eval_form_call; /**< direct call from eval */
-  uint8_t jerry_api_available; /**< API availability flag */
+  uint32_t status_flags; /**< run-time flags */
 
 #ifndef CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE
   uint8_t ecma_prop_hashmap_alloc_state; /**< property hashmap allocation state: 0-4,
                                           *   if !0 property hashmap allocation is disabled */
-  bool ecma_prop_hashmap_alloc_last_is_hs_gc; /**< true, if and only if the last gc action was a high severity gc */
 #endif /* !CONFIG_ECMA_PROPERTY_HASHMAP_DISABLE */
 
 #ifndef CONFIG_DISABLE_REGEXP_BUILTIN