[clang] [clang][ExtractAPI] Record availability information only for the target platform (PR #76823)

[Daniel Grumberg via cfe-commits]

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@@ -256,14 +256,14 @@ struct APIRecord {
   APIRecord() = delete;
 
   APIRecord(RecordKind Kind, StringRef USR, StringRef Name,
-            PresumedLoc Location, AvailabilitySet Availabilities,
+            PresumedLoc Location, const AvailabilityInfo &Availability,
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daniel-grumberg wrote:

Can you keep this as a value and bring back the `std::move` below, this allows to prevent unnecessary copies.

https://github.com/llvm/llvm-project/pull/76823