[csmith-project/creduce] 605490: Use `#!/usr/bin/env bash` in tests.

[Eric Eide <eeide@cs.utah.edu>]

  Branch: refs/heads/master
  Home:   https://github.com/csmith-project/creduce
  Commit: 60549085767b87bba1ae00bc921b736f1c78f320
      https://github.com/csmith-project/creduce/commit/60549085767b87bba1ae00bc921b736f1c78f320
  Author: Eric Eide <eeide@cs.utah.edu>
  Date:   2016-04-25 (Mon, 25 Apr 2016)

  Changed paths:
    M tests/test0.sh
    M tests/test1.sh
    M tests/test2.sh
    M tests/test3.sh
    M tests/test4.sh
    M tests/test5.sh
    M tests/test6.sh
    M tests/test7.sh

  Log Message:
  -----------
  Use `#!/usr/bin/env bash` in tests.

Make the test scripts more portable to systems like FreeBSD, where
`bash` isn't in `/bin`.