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Support an implicit conversion from `T*` to `Cpp.void*` and to `const Cpp.void*`, and an `unsafe as` conversion in the opposite direction. In order to support C++ calls taking and returning `void*` (which get mapped to Carbon `Optional(Cpp.void*)`, also support conversions from `Optional(T)` to `Optional(U)` if there's a conversion from `T` to `U`. Fix a bug in `OptionalStorage` for `T*` where its `HasValue` was exactly backwards.