Rollup merge of #152758 - cjgillot:noinit-box, r=RalfJung

Remove ShallowInitBox.

All uses of this were removed by https://github.com/rust-lang/rust/pull/148190
Split from https://github.com/rust-lang/rust/pull/147862

r? @RalfJung

clippy_utils/src/qualify_min_const_fn.rs

@@ -194,7 +194,6 @@ fn check_rvalue<'tcx>(
                 ))
             }
         },
-        Rvalue::ShallowInitBox(_, _) => Ok(()),
         Rvalue::UnaryOp(_, operand) => {
             let ty = operand.ty(body, cx.tcx);
             if ty.is_integral() || ty.is_bool() {