Aleksandr Platonov b59461ac63 [ADT] Add back ability to compare StringSet (#91374) ...

StringSet comparison was broken after moving from llvm::Optional to
std::optional because std::nullopt_t is not equality-comparable. Without
this patch a try to compare objects of StringSet type leads to
compilation error:
```
llvm-project/llvm/include/llvm/ADT/StringMap.h:294:33: error: no match for ‘operator==’ (operand types are ‘std::nullopt_t’ and ‘std::nullopt_t’)
294 |       if (!(KeyValue.getValue() == FindInRHS->getValue()))
```

2024-05-08 09:40:16 -07:00

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