rust/tests/mir-opt/reference_prop.unique_with_copies.ReferencePropagation.diff

- // MIR for `unique_with_copies` before ReferencePropagation
+ // MIR for `unique_with_copies` after ReferencePropagation
  
  fn unique_with_copies() -> () {
      let mut _0: ();
      let _1: *mut i32;
      let mut _2: i32;
      let _4: ();
      let mut _5: i32;
      let _6: ();
      let mut _7: i32;
      scope 1 {
-         debug y => _1;
+         debug y => _3;
      }
      scope 2 {
          debug a => _2;
          let _3: *mut i32;
          scope 3 {
              debug x => _3;
          }
      }
  
      bb0: {
-         StorageLive(_1);
          StorageLive(_2);
          _2 = const 0_i32;
-         StorageLive(_3);
          _3 = &raw mut _2;
          StorageLive(_4);
          StorageLive(_5);
          _5 = copy (*_3);
          _4 = opaque::<i32>(move _5) -> [return: bb1, unwind continue];
      }
  
      bb1: {
          StorageDead(_5);
          StorageDead(_4);
-         _1 = copy _3;
-         StorageDead(_3);
          StorageDead(_2);
          StorageLive(_6);
          StorageLive(_7);
-         _7 = copy (*_1);
+         _7 = copy (*_3);
          _6 = opaque::<i32>(move _7) -> [return: bb2, unwind continue];
      }
  
      bb2: {
          StorageDead(_7);
          StorageDead(_6);
          _0 = const ();
-         StorageDead(_1);
          return;
      }
  }