[Bug breakpoints/18267] New: Need breakpoint count limit, akin to new tab completion limit

["dje at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18267

            Bug ID: 18267
           Summary: Need breakpoint count limit, akin to new tab
                    completion limit
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: dje at google dot com

A user did "break foo.h:42" and gdb hung.
The user gave up waiting, but if one waits it turns out there were >12,000
hits.

I think this case is sufficiently equivalent to the tab completion limit issue
we recently addressed, and a similar solution would work.
Also, the fact that ^c didn't work is another bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=18266

Alternatively, IWBN if gdb could print a running tally of how many breakpoints
it has found (and allow the user to ^c). But printing running tallies would
require more effort on the CLI front.

The high order bit is being more user friendly, and for now I think being able
to have a limit suffices.

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