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Addresses comments from this discussion: https://github.com/carbon-language/carbon-lang/pull/2460#discussion_r1046444433 Features: * Move subtyping logic from Interpreter to TypeChecker, exposing subtyping as a series of access to `.base`. * Excludes function parameter conversion, which is still done in ::Convert due to parameters conversion being handled differently. Changes: * Add new `class BaseAccessExpression : public MemberAccessExpression`, allowing rewrites * Handle `BaseAccessExpression` expression type in Interpreter * Move subtyping logic to `TypeChecker::ImplicitlyConvert`