gdb/

gdb/
	* cli-logging.c: Include gdb_assert.h.
	(set_logging_overwrite): New function.
	(logging_redirect): New comment.
	(logging_no_redirect_file, set_logging_redirect)
	(pop_output_files) <logging_no_redirect_file>: New.
	(handle_redirections) <!logging_redirect>: New variable
	no_redirect_file.  Remove file autoclose for tee_file_new.  No longer
	discard cleanup for the close of former OUTPUT.  Set
	LOGGING_NO_REDIRECT_FILE.
	(handle_redirections) <logging_redirect>: gdb_assert
	LOGGING_NO_REDIRECT_FILE.
	(show_logging_command) <logging_redirect handling>: Adjust messages
	for SAVED_FILENAME not NULL.
	(_initialize_cli_logging): Install set_logging_overwrite and
	set_logging_redirect.