[Perl/perl5] bc462b: Benchmark.t - sanity check for a broken times()

[Yves Orton via perl5-changes]

  Branch: refs/heads/yves/benchmark_times_sanity_check
  Home:   https://github.com/Perl/perl5
  Commit: bc462b987fb47cfcfd4faa573600be9745772399
      
https://github.com/Perl/perl5/commit/bc462b987fb47cfcfd4faa573600be9745772399
  Author: Yves Orton <demer...@gmail.com>
  Date:   2023-02-22 (Wed, 22 Feb 2023)

  Changed paths:
    M lib/Benchmark.t

  Log Message:
  -----------
  Benchmark.t - sanity check for a broken times()

If time() or times() is broken then Benchmark can infinite loop.
This adds a sanity check that will die early if it appears that
either are broken.

This fixes the infinite loop part of GH Issue #20839