rustup: fix breakage from https://github.com/rust-lang/rust/pull/45225

Cargo.lock

Cargo.toml

src/cast.rs

src/error.rs

src/eval_context.rs

src/lib.rs

src/lvalue.rs

src/memory.rs

src/step.rs

src/terminator/intrinsic.rs

src/terminator/mod.rs

src/traits.rs

src/value.rs

tests/compile-fail/reference_to_packed.rs

tests/compile-fail/reference_to_packed_unsafe.rs

tests/compile-fail/repeat.rs

tests/compiletest.rs

tests/run-pass/packed_struct.rs

tests/run-pass/u128.rs