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Features: * Adds support for [subtyping](https://github.com/carbon-language/carbon-lang/blob/trunk/docs/design/classes.md#subtyping) for local variables, and function parameters Changes: * Update function parameter `Deduce` to handle subtyping * Update `InstantiateType` to support `PointerType` * Update `Convert` to support convertion from child class to a base class Relates to #1881 Co-authored-by: Jon Ross-Perkins <jperkins@google.com> Co-authored-by: Geoff Romer <gromer@google.com>