expr_to_known_chunk_sym
char *expr_to_known_chunk_sym(struct expression *expr, struct symbol **sym);
name = expr_to_known_chunk_sym(expr, &sym);
name = expr_to_known_chunk_sym(expr, &sym);
name = expr_to_known_chunk_sym(expr, &sym);
var = expr_to_known_chunk_sym(expr, &sym);