[Bug gdb/28717] New: GDB steps twice on a single stepi

["qwertytmp1 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28717

            Bug ID: 28717
           Summary: GDB steps twice on a single stepi
           Product: gdb
           Version: 11.1
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: qwertytmp1 at gmail dot com
  Target Milestone: ---

On ARM/aarch64 platform, when executing command:
```
stepi
```

address increases by 8 bytes, instead of 4.

When I printed packets, received from the DGB client, I've found that it
consists of strange workflow:

```
'm1e2f8,4'    - read 4 bytes memory at 0x1e2f8
'vCont?'      - request a list of actions supported by the ‘vCont’ packet.
'vCont;s:1;c' - resume the inferior, singlestep, continue.
'g'           - return the value of the CPU registers
'm1e2fc,4'    - read 4 bytes memory at 0x1e2fc
'vCont;s:1'   - resume the inferior, singlestep.
'g'           - return the value of the CPU registers
...
```

As it can be seen, we have 'vCont;s:1;c' and 'vCont;s:1'.

P.S. Problem exists as on gdb-9.1 as on the gdb-11.1.

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