chore: refactor optimizer/add more superinstructions #453

Job	Run time
Build wasm	3m 1s
Run tests on Linux arm64	37s
Run tests on Linux x86 (stable)	27s
Run tests on Linux x86 (stable, no default features)	22s
Run tests on Linux x86 (nightly)	38s
Run tests on Linux x86 (nightly, no default features)	37s
Run tests on Linux armv7	38s
Run tests on macOS arm64 (Apple M1)	25s
	6m 45s

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