Remove MerkleSinsemillaInstructions #499

Job	Run time
Bitrot check	1m 34s
Build target wasm32-unknown-unknown	2m 27s
Build target wasm32-wasi	2m 27s
Intra-doc links	2m 5s
Book tests	2m 11s
Rustfmt	14s
Test on ubuntu-latest	10m 42s
Test on i686-unknown-linux-gnu	21m 47s
Test on windows-latest	14m 13s
Test on i686-unknown-linux-gnu with beta features	21m 57s
Test on macOS-latest	8m 35s
Test on i686-unknown-linux-gnu with nightly features	22m 20s
Test on ubuntu-latest with beta features	10m 32s
Test on windows-latest with beta features	14m 4s
Test on macOS-latest with beta features	8m 44s
Test on ubuntu-latest with nightly features	11m 1s
Test on windows-latest with nightly features	14m 39s
Test on macOS-latest with nightly features	9m 27s
	2h 58m 59s

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