sandbox code optimization #516

Job	Run time
checks (vmm/sandbox, --all-features)	9m 23s
checks (vmm/task, --all-features)	7m 24s
checks (shim, --all-features)	7m 15s
checks (quark, --all-features)	9m 54s
checks (wasm, --features=wasmedge, 0.11.2)	7m 53s
checks (wasm, --features=wasmtime)	8m 30s
tests (vmm/sandbox, --all-features)	5m 20s
tests (vmm/task, --all-features)	4m 29s
tests (shim, --all-features)	4m 0s
tests (quark, --all-features)	3m 57s
tests (wasm, --features=wasmedge, 0.11.2)	5m 17s
tests (wasm, --features=wasmtime)	5m 45s
	1h 19m 7s

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