Add `DebugOptions::show_unaligned` #12849

Job	Run time
android	22s
Check wasm32 + wasm-bindgen	2m 22s
cargo-deny aarch64-apple-darwin	40s
cargo-deny aarch64-linux-android	37s
Check wasm32+atomics	1m 31s
cargo-deny i686-pc-windows-gnu	35s
Format + check + test	16m 24s
cargo-deny i686-pc-windows-msvc	37s
ios	22s
cargo-deny i686-unknown-linux-gnu	36s
cargo-deny wasm32-unknown-unknown	39s
cargo-deny x86_64-apple-darwin	36s
cargo-deny x86_64-pc-windows-gnu	36s
cargo-deny x86_64-pc-windows-msvc	40s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	36s
Check Windows	1m 32s
	30m 1s

Provide feedback