Remove `checked` variants of u32 MASM instructions #4143

Job	Run time
rustfmt	13s
Clippy	1m 5s
no-std (stable, wasm32-unknown-unknown)	1m 3s
Check Rust stable on ubuntu with --all-targets --no-default-features	56s
no-std (nightly, wasm32-unknown-unknown)	1m 14s
Check Rust stable on ubuntu with --all-targets	58s
Test Rust stable on ubuntu with --profile test-release	8m 3s
Test Rust nightly on windows-2022	0s
Check Rust stable on ubuntu with --all-targets --all-features	1m 39s
Test Rust stable on ubuntu with --profile test-release --doc	6m 3s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 1s
Test Rust nightly on ubuntu with --profile test-release	8m 33s
Check Rust nightly on ubuntu with --all-targets	1m 32s
Test Rust nightly on ubuntu with --profile test-release --doc	4m 12s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 24s
	37m 56s

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