Update stack protector test

We no longer generate a protector for the strong case in this test,
which is actually the expected behavior per the test comment.

Author: nikic

Diff for: tests/assembly/stack-protector/stack-protector-heuristics-effect.rs

@@ -371,7 +371,7 @@ pub fn unsized_fn_param(s: [u8], l: bool, f: fn([u8])) {
 
 
     // all: __stack_chk_fail
-    // strong: __stack_chk_fail
+    // strong-NOT: __stack_chk_fail
     // basic-NOT: __stack_chk_fail
     // none-NOT: __stack_chk_fail
     // missing-NOT: __stack_chk_fail