[API] Introduce jerry_parse_and_save_literals() (#1500)

This function can be used to save literals into a specific file in a list or C format.
These literals are valid identifiers, and doesn't match to any magic-string.
The '--save-literals-list-format FILE' and '--save-literals-c-format FILE'
options are used to save into the given file, when the snapshot-save is enabled.
The saved literals are sorted by size and lexicographically.
The C-format is useful for jerry_register_magic_strings() to generate the array
of external magic strings.

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

jerry-core/jerry-api.h

@@ -323,6 +323,8 @@ bool jerry_foreach_object_property (const jerry_value_t obj_val, jerry_object_pr
 size_t jerry_parse_and_save_snapshot (const jerry_char_t *source_p, size_t source_size, bool is_for_global,
                                       bool is_strict, uint8_t *buffer_p, size_t buffer_size);
 jerry_value_t jerry_exec_snapshot (const void *snapshot_p, size_t snapshot_size, bool copy_bytecode);
+size_t jerry_parse_and_save_literals (const jerry_char_t *source_p, size_t source_size, bool is_strict,
+                                      uint8_t *buffer_p, size_t buffer_size, bool is_c_format);
 
 /**
  * @}