[Bug cli/24788] Add support for 'reverse-until'

["blarsen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24788

Guinevere Larsen <blarsen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |blarsen at redhat dot com
           Keywords|                            |good-first-bug
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-11-29

--- Comment #1 from Guinevere Larsen <blarsen at redhat dot com> ---
Right now you can use 'set exec-direction reverse' and then 'until <line>' to
execute the inferior until a desired line, but if you try to use 'until' with
no arguments, it will run to the end of the function (or execution history)
instead of leaving a loop.

Meaning this is effectively 2 bugs: we need to fix the execution with no
parameters, and we need a new command that will automagically set the execution
direction and reset- it afterwards (like 'reverse-next').

Ideally, these problems should be solved in order, so it doesn't feel like we
have a "half-baked" feature, but if someone were to submit a patch that makes
until error out on the first condition (executing in reverse and called with no
arguments) and adds the command, I think it would already be an improvement
over current behaviour.

Seeing as this new command shouldn't be too difficult to implement, I'm marking
this as a good-first-bug.

I filed a second bug for the 'until' changes, 
https://sourceware.org/bugzilla/show_bug.cgi?id=31094

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