ash: add all hush parsing tests to ast tests

All pass.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-parsing/argv0.tests b/shell/ash_test/ash-parsing/argv0.tests
new file mode 100755
index 0000000..f5c40f6
--- /dev/null
+++ b/shell/ash_test/ash-parsing/argv0.tests
@@ -0,0 +1,4 @@
+if test $# = 0; then
+    exec "$THIS_SH" "$0" arg
+fi
+echo OK