Nikita Popov ac47db6aca [Attributes] Return Optional from getAllocSizeArgs() (NFC) ...

As suggested on D135572, return Optional<> from getAllocSizeArgs()
rather than the peculiar pair(0, 0) sentinel.

The method on Attribute itself does not return Optional, because
the attribute must exist in that case.

2022-10-11 11:05:21 +02:00

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