[binutils-gdb] Have filter_results take a std::vector

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT f73c6ece7888af880d3b03b2d57ee7782f2a539b ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: f73c6ece7888af880d3b03b2d57ee7782f2a539b

Have filter_results take a std::vector

This chagnes filter_results to take a std::vector, allowing the
removal of some cleanups in its callers.

ChangeLog
2018-04-05  Tom Tromey  <tom@tromey.com>

	* linespec.c (filter_results): Use std::vector.
	(decode_line_2, decode_line_full): Update.