Use git rev-list --count

Dependencies

• [2] 3BTJRSU3 GitInput.pm: Don't do a chdir to the Git clone
• [3] JAH3UPWA Support revision control systems via plugins
• [4] B7KDPCRL Prevent inputs from being garbage collected during evaluation

Change contents

• replacement in src/lib/Hydra/Plugin/GitInput.pm at line 236
  [3.10066]→[2.2251:2356](∅→∅)
  − my $revCount = scalar(split '\n', grab(cmd => ["git", "rev-list", "$revision"], dir => $clonePath));
  [3.10066]

  [2.2356]
  + my $revCount = grab(cmd => ["git", "rev-list", "--count", "$revision"], dir => $clonePath, chomp => 1);