Rework the core of class parsing/runtime semantic (#3598)

Changes:
 - Use the pre-scanner to provide information for the parser about the existence of the class constructor
 - The allocation of the super declarative environment is no longer needed
 - The VM frame context holds the information about the this binding status
 - Reduce the number of class related VM/CBC instructions
 - Improve ecma_op_function_{construct, call} to properly set new.target

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/parser/js/js-parser.h

@@ -133,7 +133,7 @@ typedef enum
   PARSER_ERR_CLASS_CONSTRUCTOR_AS_ACCESSOR,           /**< class constructor cannot be an accessor */
   PARSER_ERR_CLASS_CONSTRUCTOR_AS_GENERATOR,          /**< class constructor cannot be a generator */
   PARSER_ERR_CLASS_STATIC_PROTOTYPE,                  /**< static method name 'prototype' is not allowed */
-  PARSER_ERR_UNEXPECTED_SUPER_REFERENCE,              /**< unexpected super keyword */
+  PARSER_ERR_UNEXPECTED_SUPER_KEYWORD,                /**< unexpected super keyword */
 
   PARSER_ERR_RIGHT_BRACE_EXPECTED,                    /**< right brace expected */
   PARSER_ERR_OF_EXPECTED,                             /**< of keyword expected */