Integrate 16-bit lossless inverse transform assembly functions #4680

Job	Run time
rustfmt-clippy	2m 19s
build-windows (cargo-build, x86_64-pc-windows-msvc)	12m 36s
build-unix (beta-build)	4m 51s
build-windows (cargo-test, x86_64-pc-windows-msvc)	12m 19s
build-macos (Cargo build (x64), cargo-build, x86_64-apple-darwin)	6m 3s
build-unix (1.70.0-tests)	5m 34s
build-windows (cargo-c, x86_64-pc-windows-gnu)	15m 44s
build-macos (Cargo test (x64), cargo-test, x86_64-apple-darwin)	10m 8s
build-unix (aom-tests)	8m 30s
build-macos (Cargo C-build (x64), cargo-c, x86_64-apple-darwin)	7m 24s
build-unix (dav1d-tests)	10m 53s
build-macos (Cargo build (Arm64), cargo-build, aarch64-apple-darwin)	3m 17s
build-unix (no-asm-tests)	10m 48s
build-macos (Cargo C-build (Arm64), cargo-c, aarch64-apple-darwin)	7m 20s
build-unix (grcov-codecov)	12m 36s
build-unix (bench)	6m 2s
build-unix (doc)	2m 42s
build-unix (cargo-c)	7m 39s
build-unix (check-no-default)	1m 58s
build-unix (check-extra-feats)	3m 33s
build-unix (check-unstable-feats)	2m 44s
build-unix (fuzz)	5m 48s
build-unix (dav1d-tests-arm64, stable)	9m 17s
	2h 50m 5s

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