1486264d5f
This patch changes the interface of StructuredData::Array::GetItemAtIndexAsString to return a `std::optional<llvm::StringRef>` instead of taking an out parameter. More generally, this commit serves as proposal that we change all of the sibling APIs (`GetItemAtIndexAs`) to do the same thing. The reason this isn't one giant patch is because it is rather unwieldy changing just one of these, so if this is approved, I will do all of the other ones as individual follow-ups.
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