sha2

sha2: move `opaque_load` to the utils module #1208

Job	Run time
riscv32-zknh	1m 28s
riscv64-zknh	1m 33s
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	3s
macos (1.79.0)	33s
linux (i686-unknown-linux-gnu, 1.79.0, sudo apt update && sudo apt install gcc-multilib)	1m 21s
macos (stable)	29s
cross (1.79.0, aarch64-unknown-linux-gnu, default)	55s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 4s
build (1.79.0, thumbv7em-none-eabi)	31s
cross (1.79.0, powerpc-unknown-linux-gnu, default)	39s
linux (x86_64-unknown-linux-gnu, 1.79.0)	47s
build (1.79.0, wasm32-unknown-unknown)	33s
cross (stable, aarch64-unknown-linux-gnu, default)	33s
linux (x86_64-unknown-linux-gnu, stable)	42s
cross (stable, powerpc-unknown-linux-gnu, default)	34s
windows (1.79.0, x86_64-pc-windows-gnu)	1m 3s
build (1.79.0, loongarch64-unknown-linux-gnu)	31s
windows (stable, x86_64-pc-windows-gnu)	1m 39s
build (stable, thumbv7em-none-eabi)	29s
build (stable, wasm32-unknown-unknown)	38s
build (stable, loongarch64-unknown-linux-gnu)	16s
	16m 57s

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