Run filecheck on dest-prop/cycle.rs

tests/mir-opt/dest-prop/cycle.rs

@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //! Tests that cyclic assignments don't hang DestinationPropagation, and result in reasonable code.
 //@ unit-test: DestinationPropagation
@@ -8,6 +7,10 @@ fn val() -> i32 {
 
 // EMIT_MIR cycle.main.DestinationPropagation.diff
 fn main() {
+    // CHECK-LABEL: main(
+    // CHECK: debug x => [[x:_.*]];
+    // CHECK: [[x]] = val()
+    // CHECK-NOT: [[x]] = {{_.*}};
     let mut x = val();
     let y = x;
     let z = y;