add template for directives

fuzz/corpus/hashicorp%terraforminternal%terraform%testdata%plan-computed-multi-index%main.tf

@@ -0,0 +1,9 @@
+resource "aws_instance" "foo" {
+    count = 2
+    compute = "ip.#"
+}
+
+resource "aws_instance" "bar" {
+    count = 1
+    foo = "${aws_instance.foo.*.ip[count.index]}"
+}