Fix tests due to stricter invalid_value

Author: 5225225

src/test/ui/sanitize/memory.rs

@@ -14,6 +14,7 @@
 #![feature(core_intrinsics)]
 #![feature(start)]
 #![feature(bench_black_box)]
+#![allow(invalid_value)]
 
 use std::hint::black_box;
 use std::mem::MaybeUninit;

src/tools/clippy/tests/ui/uninit.rs

@@ -1,5 +1,5 @@
 #![feature(stmt_expr_attributes)]
-#![allow(clippy::let_unit_value)]
+#![allow(clippy::let_unit_value, invalid_value)]
 
 use std::mem::{self, MaybeUninit};