Make Optional support specializing its representation. #6058
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Add builtins to form and detect null `MaybeUnformed(T*)` values, and use those to represent `Optional(T*)`.
zygoloid
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Switch to using
MaybeUnformedand aboolas the normal representation forOptional(T). WhenTis a pointer type, add a customized representation that usesMaybeUnformed(T*)with a null representation used for absent values. Add builtins to produce and detect null values of typeMaybeUnformed(T*).