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> Related to #5770 ## What This PR Does Moves state that is constant over a linted file out of `LintContext` and into a shared `ContextHost` struct, turning `LintContext` into a [flyweight](https://en.wikipedia.org/wiki/Flyweight_pattern). This brings `LintContext` from 144 bytes down to 96. `Linter::run` iterates over `(rule, ctx)` pairs in a very tight loop, and each rule instance gets its own clone of `ctx`. A smaller `LintContext` means better cache locality and a smaller heap allocation for this vec. I'm hoping to eventually get it small enough to fit in a single cache line. I made a PR a while ago that did something similar to this one, but instead of using an `Rc`, each `LintContext` stored a read-only reference. This added an extra lifetime parameter, making it slightly unwieldy, but I saw up to 15%/25% perf improvements on local benchmarks. I'll dig around for it and add a link shortly. ### Architecture  ----  |
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