dbl

block-buffer: improve `split_blocks` implementations (#1220) #1910

Job	Run time
build (1.85.0, thumbv7em-none-eabi)	20s
test (stable)	24s
test (1.85.0)	17s
build (stable, thumbv7em-none-eabi)	16s
build (1.85.0, wasm32-unknown-unknown)	16s
build (stable, wasm32-unknown-unknown)	20s
minimal-versions / minimal-versions	30s
	2m 23s

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