Update `dashmap`, `hashlink`, and `rustc-hash`

[MichaReiser]

Update dashmap, hashlink and rustc-hash to the most recent major version.

dashmap

This release contains performance optimizations, most notably 10-40% gains on Apple Silicon but also 5-10% gains when measured in Intel Sapphire Rapids. This work was accomplished in:

It's a major because there's a slight API change.

hashlink

API incompatible change: Don't panic in reserve and try_reserve in cases where a rehash is needed. Previously would panic, adds the proper bounds on reserve methods to do a rehash (previously bounds were missing, and reserve would result in panics). (Thank you cuviper!)

I think that's fine

rustc-hash

Replace hash with faster and better finalized hash. This replaces the previous "fxhash" algorithm originating in Firefox with a custom hasher designed and implemented by Orson Peters (orlp). It was measured to have slightly better performance for rustc, has better theoretical properties and also includes a signficantly better string hasher.

[netlify[bot]]

✅ Deploy Preview for salsa-rs canceled.

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[davidbarsky]

Using this commit against https://github.com/davidbarsky/salsa-benchmarks/, I saw an 11-12% improvement (418.66ns versus 466.92ns on compare/new_salsa_length/1).

[nikomatsakis]

Needs rebase but r=me

[MichaReiser]

@nikomatsakis done