Add FileCheck to issue_107511.rs

Author: Shunpoco

tests/mir-opt/copy-prop/issue_107511.rs

@@ -1,9 +1,12 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 //@ test-mir-pass: CopyProp
 
 // EMIT_MIR issue_107511.main.CopyProp.diff
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug i => [[i:_.*]];
+    // CHECK-NOT: StorageLive([[i]]);
+    // CHECK-NOT: StorageDead([[i]]);
     let mut sum = 0;
     let a = [0, 10, 20, 30];