* h8300/h8300.c (h8300_monitor_function_p): New function.
        (h8300_os_task_function_p): Likewise.
        (os_task, monitor): Variables to note if the current
        function is an os_task or monitor.
        (function_prologue): Set monitor and/or os_task as needed.  Handle
        os_task and monitor functions.
        (function_epilogue): Clear monitor and os_task.  Handle os_task and
        monitor functions.
        (h8300_valid_machine_decl_attribute): Accept "OS_Task" and
        "monitor".

From-SVN: r12205