[Bug breakpoints/22511] New: Regression in "commands"

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22511

            Bug ID: 22511
           Summary: Regression in "commands"
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com
  Target Milestone: ---

Filing this so we don't forget before the 8.1 release.  

>From https://sourceware.org/ml/gdb-patches/2017-11/msg00088.html :

~~~
Pedro pointed out a regression in "commands", where trying to clear a
breakpoint's command list would fail:

    (top-gdb) commands
    Type commands for breakpoint(s) 3, one per line.
    End with a line saying just "end".
    >end
    No breakpoints specified.
    (top-gdb)

I believe the bug was introduced by my patch that changes
counted_command_line to be a shared_ptr.  This causes the problem
because now the counted_command_line in commands_command_1 can be NULL,
whereas previously it never could be.
~~~

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