[PATCH] Make "set disassemble-next-line on" can work with DUMMY_FRAME, SIGTRAMP_FRAME and ARCH_FRAME

[Hui Zhu <hui_zhu at mentor dot com>]

When GDB debug DUMMY_FRAME, SIGTRAMP_FRAME and ARCH_FRAME, even if
"set disassemble-next-line on", it will not output the asm code:
(gdb) set disassemble-next-line on
(gdb) si
<signal handler called>
(gdb)
<signal handler called>
(gdb)
<signal handler called>

So make this patch make they can work together, it will become:
(gdb) si
<signal handler called>
=> 0xffffffff816bfb09 <int_with_check+0>:    65 48 8b 0c 25 c8 c7 00 
00    mov    %gs:0xc7c8,%rcx
(gdb)
<signal handler called>
=> 0xffffffff816bfb12 <int_with_check+9>:    48 81 e9 d8 1f 00 00   
 sub    $0x1fd8,%rcx
(gdb)
<signal handler called>
=> 0xffffffff816bfb19 <int_with_check+16>:    8b 51 10  mov    
0x10(%rcx),%edx

Thanks,
Hui

2014-04-25  Hui Zhu  <hui@codesourcery.com>

    * stack.c (print_frame_info): Call do_gdb_disassembly with
    DUMMY_FRAME, SIGTRAMP_FRAME and ARCH_FRAME.

--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -836,6 +836,13 @@ print_frame_info (struct frame_info *fra
       ui_out_text (uiout, "\n");
       annotate_frame_end ();

+      /* If disassemble-next-line is set to auto or on output the next
+     instruction.  */
+      if (disassemble_next_line == AUTO_BOOLEAN_AUTO
+      || disassemble_next_line == AUTO_BOOLEAN_TRUE)
+    do_gdb_disassembly (get_frame_arch (frame), 1,
+                get_frame_pc (frame), get_frame_pc (frame) + 1);
+
       do_cleanups (uiout_cleanup);
       return;
     }