Run filecheck on dest-prop/branch.rs

Author: CastilloDel

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

@@ -1,4 +1,3 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //! Tests that assignment in both branches of an `if` are eliminated.
 //@ unit-test: DestinationPropagation
@@ -12,6 +11,8 @@ fn cond() -> bool {
 
 // EMIT_MIR branch.foo.DestinationPropagation.diff
 fn foo() -> i32 {
+    // CHECK-LABEL: fn foo
+    // CHECK-NOT: {{_.*}} = {{_.*}}
     let x = val();
 
     let y = if cond() {