Matheus Izvekov cfee056b4e [clang] NFC: introduce UnsignedOrNone as a replacement for std::optional<unsigned> (#134142) ...

This introduces a new class 'UnsignedOrNone', which models a lite
version of `std::optional<unsigned>`, but has the same size as
'unsigned'.

This replaces most uses of `std::optional<unsigned>`, and similar
schemes utilizing 'int' and '-1' as sentinel.

Besides the smaller size advantage, this is simpler to serialize, as its
internal representation is a single unsigned int as well.

2025-04-03 14:27:18 -03:00

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