t7004: give the test a bit more stack space

It was reported that the allocated stack space was too small for
some archs openSUSE buildfarm runs the tests on.  Double it while
also doubling the amount of data to be handled.

Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Suggested-by: Jeff King <peff@peff.net>
Tested-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7004-tag.sh

@@ -1424,7 +1424,7 @@ EOF
 '
 
 run_with_limited_stack () {
-	(ulimit -s 64 && "$@")
+	(ulimit -s 128 && "$@")
 }
 
 test_lazy_prereq ULIMIT 'run_with_limited_stack true'
@@ -1433,7 +1433,7 @@ test_lazy_prereq ULIMIT 'run_with_limited_stack true'
 test_expect_success ULIMIT '--contains works in a deep repo' '
 	>expect &&
 	i=1 &&
-	while test $i -lt 4000
+	while test $i -lt 8000
 	do
 		echo "commit refs/heads/master
 committer A U Thor <author@example.com> $((1000000000 + $i * 100)) +0200