Rollup merge of #73800 - nikic:hash_i, r=kennytm

Forward Hash::write_iN to Hash::write_uN

The `Hasher::write_iN()` methods should forward to `Hasher::write_uN()`, because some Hasher implementations implement only the `write_uN()` variants, with the expectation that `write_iN()` will use the same implementation. Most notably, this is the case for the [FxHasher](https://github.com/rust-lang/rustc-hash/blob/5e09ea0a1c7ab7e4f9e27771f5a0e5a36c58d1bb/src/lib.rs#L111) used by rustc itself.

This used to be the case previously, but was broken in #59982. As the PR description makes no mention of this particular change, I assume it was unintentional.

In a local test, this mitigates the regression from #73526 on at least one test-case (cc @cuviper), because we're no longer at the mercy of `FxHasher::write()` getting inlined to get reasonable performance.

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