Rework error to use a global slot to store the error value.

This change frees up the error bit in ecma_value_t, which allows
to define 4 more value types (e.g. symbols). To keep API
compatibility we introduce a box for values with error flag.

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

jerry-core/ecma/operations/ecma-promise-object.c

@@ -24,6 +24,7 @@
 #include "ecma-objects.h"
 #include "ecma-objects-general.h"
 #include "ecma-promise-object.h"
+#include "jcontext.h"
 
 #ifndef CONFIG_DISABLE_ES2015_PROMISE_BUILTIN
 
@@ -547,7 +548,7 @@ ecma_op_create_promise_object (ecma_value_t executor, /**< the executor function
   if (ECMA_IS_VALUE_ERROR (completion))
   {
     /* 10.a. */
-    completion = ecma_get_value_from_error_value (completion);
+    completion = JERRY_CONTEXT (error_value);
     status = ecma_op_function_call (ecma_get_object_from_value (funcs->reject),
                                     ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED),
                                     &completion,