ref_deref.main.ConstProp.diff

- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/ref_deref.rs:4:11: 4:11
      let _1: i32;                         // in scope 0 at $DIR/ref_deref.rs:5:5: 5:10
      let mut _2: &i32;                    // in scope 0 at $DIR/ref_deref.rs:5:6: 5:10
      let _3: i32;                         // in scope 0 at $DIR/ref_deref.rs:5:8: 5:9
      let mut _4: &i32;                    // in scope 0 at $DIR/ref_deref.rs:5:6: 5:10
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/ref_deref.rs:5:5: 5:10
          StorageLive(_2);                 // scope 0 at $DIR/ref_deref.rs:5:6: 5:10
          _4 = const main::promoted[0];    // scope 0 at $DIR/ref_deref.rs:5:6: 5:10
                                           // ty::Const
                                           // + ty: &i32
                                           // + val: Unevaluated(main, [], Some(promoted[0]))
                                           // mir::Constant
                                           // + span: $DIR/ref_deref.rs:5:6: 5:10
                                           // + literal: Const { ty: &i32, val: Unevaluated(Unevaluated { def: WithOptConstParam { did: DefId(0:3 ~ ref_deref[HASH]::main), const_param_did: None }, substs_: Some([]), promoted: Some(promoted[0]) }) }
          _2 = _4;                         // scope 0 at $DIR/ref_deref.rs:5:6: 5:10
-         _1 = (*_2);                      // scope 0 at $DIR/ref_deref.rs:5:5: 5:10
+         _1 = const 4_i32;                // scope 0 at $DIR/ref_deref.rs:5:5: 5:10
          StorageDead(_2);                 // scope 0 at $DIR/ref_deref.rs:5:10: 5:11
          StorageDead(_1);                 // scope 0 at $DIR/ref_deref.rs:5:10: 5:11
          nop;                             // scope 0 at $DIR/ref_deref.rs:4:11: 6:2
          return;                          // scope 0 at $DIR/ref_deref.rs:6:2: 6:2
      }
  }