[Bug tdep/31278] GDB on arm-linux-gnueabihf fails gdb.reverse/func-map-to-same-line.exp

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31278

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
This is a reasonably minimal version:
...
$ gdb -q -batch -x gdb.in
+file outputs/gdb.reverse/func-map-to-same-line/func-map-to-same-line
+b *func2+8
Breakpoint 1 at 0x4f6: file
/home/rock/gdb/src/gdb/testsuite/gdb.reverse/func-map-to-same-line.c, line 27.
+run

Breakpoint 1, 0xaaaaa4f6 in func2 () at
/home/rock/gdb/src/gdb/testsuite/gdb.reverse/func-map-to-same-line.c:27
27      } /* END FUNC2 */
+record
+target record-full
+print $r13
$1 = (void *) 0xfffef4f4
+stepi
0xaaaaa4fa      27      } /* END FUNC2 */
+print $r13
$2 = (void *) 0xfffef4f8
+reverse-stepi
+stepi 

No more reverse-execution history.
0xaaaaa4f6 in func2 () at
/home/rock/gdb/src/gdb/testsuite/gdb.reverse/func-map-to-same-line.c:27
27      } /* END FUNC2 */
+print $r13
$3 = (void *) 0xfffef4f8
...

The insn is:
...
 4f6:   f85d 7b04       ldr.w   r7, [sp], #4
...
which modifies the sp by 4, but reverse execution fails to detect this and
revert the effect.

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