Bless mir-opt tests to account for rust-lang#72220

Author: wesleywiser

src/test/mir-opt/const_prop/mutable_variable_aggregate_partial_read/rustc.main.ConstProp.diff

@@ -29,16 +29,14 @@
                                            // + ty: i32
                                            // + val: Value(Scalar(0x00000063))
                                            // mir::Constant
--                                          // + span: $DIR/mutable_variable_aggregate_partial_read.rs:6:11: 6:13
-+                                          // + span: $DIR/mutable_variable_aggregate_partial_read.rs:6:5: 6:13
+                                           // + span: $DIR/mutable_variable_aggregate_partial_read.rs:6:11: 6:13
                                            // + literal: Const { ty: i32, val: Value(Scalar(0x00000063)) }
           (_1.0: i32) = const 42i32;       // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:7:5: 7:13
                                            // ty::Const
                                            // + ty: i32
                                            // + val: Value(Scalar(0x0000002a))
                                            // mir::Constant
--                                          // + span: $DIR/mutable_variable_aggregate_partial_read.rs:7:11: 7:13
-+                                          // + span: $DIR/mutable_variable_aggregate_partial_read.rs:7:5: 7:13
+                                           // + span: $DIR/mutable_variable_aggregate_partial_read.rs:7:11: 7:13
                                            // + literal: Const { ty: i32, val: Value(Scalar(0x0000002a)) }
           StorageLive(_2);                 // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:8:9: 8:10
 -         _2 = (_1.1: i32);                // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:8:13: 8:16