POSIX sh does not support the == for string comparisons, use = instead.

These contrib scripts all use a bash shebang so == does work, but
there's no reason they can't just use the more portable form anyway.

	PR bootstrap/105831

contrib/ChangeLog:

	* bench-stringop: Use = operator instead of ==.
	* repro_fail: Likewise.

contrib/reghunt/ChangeLog:

	* bin/reg-hunt: Use = operator instead of ==.

contrib/
	* repro_fail: filter out "-ignore SIGHUP" from the spawn lines

From-SVN: r199147

From-SVN: r194903

script.

Committed to trunk.

2012-02-10   Diego Novillo  <dnovillo@google.com>

	* repro_fail: Add --debug and --debug-tui flags.

From-SVN: r184097

From-SVN: r175374