Remove unused internal functions

The internals have surprisingly large number of unused functions at
surprising places. This patch cleans them out to make maintenance
easier and to prevent dead code having effect on future decisions.

The patch intentionally does not try to clean up public API but
focuses on internal modules only that are/should not be reachable
from "outside".

However, unit tests do access private API, thus tests of literal
storage had to be adjusted.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-function-object.h

@@ -53,10 +53,6 @@ ecma_op_function_construct (ecma_object_t *, const ecma_value_t *, ecma_length_t
 extern ecma_value_t
 ecma_op_function_has_instance (ecma_object_t *, ecma_value_t);
 
-extern ecma_value_t
-ecma_op_function_declaration (ecma_object_t *, ecma_string_t *,
-                              const ecma_compiled_code_t *, bool, bool);
-
 /**
  * @}
  * @}