Converting ecma_value_t to class that is used for on-stack storage of ecma-values.

Original ecma_value_t is renamed to ecma_value_packed_t and is used for on-heap storage.
Copy and move constructors, move assignment operator of ecma_value_t are not created.
New ecma-value return convention is introduced: ecma-values are now returned through ecma_value_t &ret_val argument.

src/libecmaoperations/ecma-boolean-object.c

@@ -48,7 +48,7 @@ ecma_op_create_boolean_object (const ecma_value_t& arg) /**< argument passed to
     return conv_to_boolean_completion;
   }
 
-  ecma_simple_value_t bool_value = (ecma_is_value_true (ecma_get_completion_value_value (conv_to_boolean_completion)) ?
+  ecma_simple_value_t bool_value = (ecma_is_completion_value_normal_true (conv_to_boolean_completion) ?
                                     ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
 
 #ifndef CONFIG_ECMA_COMPACT_PROFILE_DISABLE_BOOLEAN_BUILTIN
@@ -69,5 +69,5 @@ ecma_op_create_boolean_object (const ecma_value_t& arg) /**< argument passed to
                                                                       ECMA_INTERNAL_PROPERTY_PRIMITIVE_BOOLEAN_VALUE);
   prim_value_prop_p->u.internal_property.value = bool_value;
 
-  return ecma_make_normal_completion_value (ecma_make_object_value (obj_p));
+  return ecma_make_normal_completion_value (ecma_value_t (obj_p));
 } /* ecma_op_create_boolean_object */