* flow.c (mark_regs_live_at_end): Delete unused variables.

        * ggc-page.c (ggc_page_print_statistics): bzero -> memset.

        * integrate.c (copy_rtx_and_substitute): Wrap variable `alignment'
        in macro FRAME_GROWS_DOWNWARD.

        * stmt.c (expand_end_bindings): Delete unused variable.

        * unroll.c (iteration_info): Mark parameter `loop' with
        ATTRIBUTE_UNUSED.

From-SVN: r31895