Matthias Krüger 0aa0043141
Rollup merge of #109287 - scottmcm:hash-slice-size-of-val, r=oli-obk
Use `size_of_val` instead of manual calculation

Very minor thing that I happened to notice in passing, but it's both shorter and [means it gets `mul nsw`](https://rust.godbolt.org/z/Y9KxYETv5), so why not.
2023-03-18 12:04:24 +01:00
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