This function won't work correctly on unsorted array because the second
part of the function (after the tags search) expects the array is sorted
by name. The only user of this is tm_source_file_set_tag_arglist() in which
we can go through the tags manually by ourselves (it needs only a single
value so the original behavior of tm_tags_find() wasn't a problem).
Eliminate the tags_search() function as it isn't needed any more.
Just cleanup, not functional change.
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