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Geoff RomerandRichard Smith
e5b05a1fac
The primary change in this PR is to split the `Initializing` expression category into separate `ReprInitializing` and `InPlaceInitializing` categories, depending on whether initialization uses the types initializing representation, or is guaranteed to be in place. It also rationalizes and documents the SemIR-level semantics of those categories (including where #5545's "ephemeral entire reference" category will fit), and introduces two new inst kinds to close gaps exposed in the process. Some additional secondary changes: - Consistently format the storage arguments of initializers with `to`, regardless of whether initialization is in-place, and document the `to` notation. - Rename some inst kinds and functions, and restructure some of the code, for clarity and consistency with the new documentation. - Resolve a TODO to handle more category conversions in `CategoryConverter`, in order to make it easier to reason about category conversions. See #6588 and the review history of this PR for background. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>