bless mir dump

Author: oli-obk

src/test/run-make/const_fn_mir/dump.mir

@@ -8,7 +8,7 @@ fn main() -> () {
         _1 = foo() -> bb1;               // scope 0 at main.rs:9:5: 9:10
                                          // mir::Constant
                                          // + span: main.rs:9:5: 9:8
-                                         // + literal: Const { ty: fn() -> i32 {foo}, val: Value(Scalar(<ZST>)) }
+                                         // + literal: Const { ty: fn() -> i32 {foo}, val: Value(Leaf(<ZST>)) }
     }
 
     bb1: {