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bba7f16790
I introduced some unnecessary base classes in the `TranslatedExpr` hierarchy with a previous commit. This commit refactors the hierarchy a bit to align with the following high-level description: `TranslatedExpr` represents a translated piece of an `Expr`. Each `Expr` has exactly one `TranslatedCoreExpr`, which produces the result of that `Expr` ignoring any lvalue-to-rvalue conversion on its result. If an lvalue-to-rvalue converison is present, there is an additional `TranslatedLoad` for that `Expr` to do the conversion. For higher-level `Expr`s like `NewExpr`, there can also be additional `TranslatedExpr`s to represent the sub-operations within the overall `Expr`, such as the allocator call.