[PATCH] Move declaration of breakpoint_chain to the header.

[Tom Tromey]

>>>>> "Christian" == Christian Biesinger via gdb-patches <gdb-patches@sourceware.org> writes:

Christian> TUI was using it.
Christian> gdb/ChangeLog:

Christian> 2019-10-07  Christian Biesinger  <cbiesinger@google.com>

Christian> 	* breakpoint.c (breakpoint_chain): Move comment to header.
Christian> 	* breakpoint.h (breakpoint_chain): Declare.
Christian> 	* tui/tui-winsource.c (tui_source_window_base::update_breakpoint_info):
Christian> 	Remove declaration of breakpoint_chain.

I think it would be preferable to change the TUI to use
iterate_over_bp_locations or iterate_over_breakpoints instead;
then make breakpoint_chain static.

Tom