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/vm/vm-stack.h

@@ -74,7 +74,6 @@ typedef enum
   VM_CONTEXT_FOR_IN,                          /**< for-in context */
 #if ENABLED (JERRY_ES2015)
   VM_CONTEXT_FOR_OF,                          /**< for-of context */
-  VM_CONTEXT_SUPER_CLASS,                     /**< super class context */
 #endif /* ENABLED (JERRY_ES2015) */
 } vm_stack_context_type_t;