aarch64-dit: have `set_dit_enabled` return previous state (#1109) #554

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	2m 53s
cross (aarch64-unknown-linux-gnu, 1.60.0)	3m 16s
build (1.60.0, wasm32-unknown-unknown)	2m 52s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	3m 3s
cross (aarch64-unknown-linux-gnu, stable)	49s
build (stable, thumbv7em-none-eabi)	19s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	2m 47s
cross (powerpc-unknown-linux-gnu, 1.60.0)	3m 16s
build (stable, wasm32-unknown-unknown)	16s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	3m 26s
cross (powerpc-unknown-linux-gnu, stable)	32s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	2m 50s
minimal-versions / minimal-versions	23s
	26m 42s

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