fix miri tests

Author: mejrs

src/tools/miri/tests/panic/mir-validation.stderr

@@ -7,9 +7,12 @@ LL |             *(tuple.0) = 1;
 
 
 thread 'rustc' ($TID) panicked at compiler/rustc_mir_transform/src/validate.rs:LL:CC:
-Box<dyn Any>
+broken MIR in Item(DefId) (after phase change to runtime-optimized) at bb0[1]:
+place (*(_2.0: *mut i32)) has deref as a later projection (it is only permitted as the first projection)
 stack backtrace:
 
+error: the compiler unexpectedly panicked. This is a bug
+