[bisect] Print search space with ascii characters Printing the matrix in a visual way was removed in a recent change. This adds that back. Change-Id: If2fe881b44e12208db53312e7c145ebdd9a5a17f Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1561137 Commit-Queue: Jerry Belton <jcecil@google.com> Reviewed-by: Aidan Wolter <awolter@google.com>
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