Implement ECMAScript 2022 private class methods and fields (#4831)

Co-authored-by: Robert Fancsik robert.fancsik@h-lab.eu
Co-authored-by: Martin Negyokru mnegyokru@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

jerry-core/lit/lit-char-helpers.h

@@ -115,6 +115,7 @@ bool lit_code_point_is_identifier_part (lit_code_point_t code_point);
 #define LIT_CHAR_TILDE       ((ecma_char_t) '~') /* tilde */
 #define LIT_CHAR_QUESTION    ((ecma_char_t) '?') /* question mark */
 #define LIT_CHAR_COLON       ((ecma_char_t) ':') /* colon */
+#define LIT_CHAR_HASHMARK    ((ecma_char_t) '#') /* hashmark */
 
 /*
  * Special characters for String.prototype.replace.

jerry-core/lit/lit-magic-strings.h

@@ -66,11 +66,18 @@ typedef enum
                                                              *   which contains references to other values */
   LIT_INTERNAL_MAGIC_STRING_ENVIRONMENT_RECORD, /**< dynamic environment record needed by class constructors */
   LIT_INTERNAL_MAGIC_STRING_CLASS_FIELD_COMPUTED, /**< computed class field name list */
+  LIT_INTERNAL_MAGIC_STRING_CLASS_PRIVATE_ELEMENTS, /**< internal collection for storing private elements */
   LIT_INTERNAL_MAGIC_STRING_CONTAINER_WEAK_REFS, /**< Weak references to the current container object */
   LIT_INTERNAL_MAGIC_STRING_WEAK_REFS, /**< Weak references to the current object */
   LIT_MAGIC_STRING__COUNT /**< number of magic strings */
 } lit_magic_string_id_t;
 
+/**
+ * Properties that are need to be ignored for opfunc_set_class_attributes
+ */
+#define LIT_INTERNAL_MAGIC_STRING_IGNORED(id) \
+  ((id) >= LIT_INTERNAL_MAGIC_STRING_CLASS_FIELD_COMPUTED && (id) <= LIT_INTERNAL_MAGIC_STRING_CLASS_PRIVATE_ELEMENTS)
+
 /**
  * Checks whether the given id corresponds to a global symbol
  */