Allan Shortlidge cce02961f9 AST/SILGen: Make availability ranges stored by PoundAvailableInfo optional. ...

Rather than representing a missing availability range on `PoundAvailableInfo`
with a default-constructed `AvailabilityRange` (empty), store the ranges as
optionals instead. This allows an empty range to represent an availability
condition which is known to be false at compile time, which will be necessary
when generating SIL for `if #available` queries that check custom availability
domains.

2025-04-01 07:46:46 -07:00

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