add crate to calculate prehashes #241

Job	Run time
Determine jobs to run	19s
Turbopack rust check	1m 23s
Check next-swc	32s
Turbopack TypeScript files	0s
Turbopack rust clippy	1m 38s
Turbopack Rust testing on macos	30m 22s
Turbopack Rust testing on ubuntu	4m 54s
Turbopack Rust testing on windows	36m 32s
Turbopack Rust testing benchmarks on linux / Test	2m 31s
Turbopack Rust testing benchmarks on macos / Test	22m 22s
Ok	4s
Done	4s
Upload Test results	36s
Cleanup / cleanup	3s
	1h 41m 20s

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