librustc: Move block contexts into per-function arenas and stack-allocate function contexts #11387
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A typed arena is a type of arena that can only allocate objects of one type. It is 3x faster than the existing arena and 13x faster than malloc on Mac.
stack-allocate function contexts.
bors
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[`unnecessary_unwrap`]: lint on `.as_ref().unwrap()` Closes rust-lang#11371 This turned out to be a little more code than I originally thought, because the lint also makes sure to not lint if the user tries to mutate the option: ```rs if option.is_some() { option = None; option.unwrap(); // don't lint here } ``` ... which means that even if we taught this lint to recognize `.as_mut()`, it would *still* not lint because that would count as a mutation. So we need to allow `.as_mut()` calls but reject other kinds of mutations. Unfortunately it doesn't look like this is possible with `is_potentially_mutated` (seeing what kind of mutation happened). This replaces it with a custom little visitor that does basically what it did before, but also allows `.as_mut()`. changelog: [`unnecessary_unwrap`]: lint on `.as_ref().unwrap()`
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r? @brson