Remove make_show_memory_breakpoints_cleanup

Remove make_show_memory_breakpoints_cleanup

This removes make_show_memory_breakpoints_cleanup, replacing it with
make_scoped_restore_show_memory_breakpoints and updating all callers.

ChangeLog
2017-09-11  Tom Tromey  <tom@tromey.com>

	* breakpoint.c (program_breakpoint_here_p): Update.
	* target.c (make_scoped_restore_show_memory_breakpoints): Rename
	from make_show_memory_breakpoints_cleanup.  Return a
	scoped_restore_tmpl<int>.
	(restore_show_memory_breakpoints): Remove.
	* ppc-linux-tdep.c (ppc_linux_memory_remove_breakpoint): Update.
	* mem-break.c (memory_validate_breakpoint): Update.
	* ia64-tdep.c (ia64_memory_insert_breakpoint): Update.
	(ia64_memory_remove_breakpoint): Update.
	(ia64_breakpoint_from_pc): Update.
	* target.h (make_scoped_restore_show_memory_breakpoints): Rename
	from make_show_memory_breakpoints_cleanup.