Decode with mem limit (#616) #204

Job	Run time
set-image	1s
fmt	57s
clippy	1m 35s
bench-rust-nightly (bit-vec)	18m 3s
checks	1m 24s
bench-rust-nightly (bytes)	16m 46s
miri (bit-vec)	5h 50m 38s
bench-rust-nightly (generic-array)	16m 27s
tests	3m 33s
miri (bytes)	3m 9s
bench-rust-nightly (derive)	16m 53s
miri (generic-array)	3m 11s
miri (arbitrary)	3m 14s
bench-rust-nightly (max-encoded-len)	17m 11s
build-linux-ubuntu-amd64	1m 9s
publish-dry-run	1m 3s
	7h 35m 14s

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