sandbox code optimization #463

Job	Run time
checks (vmm/sandbox, --all-features)	8m 5s
checks (vmm/task, --all-features)	7m 24s
checks (shim, --all-features)	8m 47s
checks (quark, --all-features)	7m 23s
checks (wasm, --features=wasmedge, 0.11.2)	10m 12s
checks (wasm, --features=wasmtime)	8m 10s
tests (vmm/sandbox, --all-features)	7m 38s
tests (vmm/task, --all-features)	4m 18s
tests (shim, --all-features)	4m 26s
tests (quark, --all-features)	4m 12s
tests (wasm, --features=wasmedge, 0.11.2)	4m 27s
tests (wasm, --features=wasmtime)	6m 4s
	1h 21m 6s

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