Egor Zhdan a7c174431f [cxx-interop] Do not crash when emitting layout of std::string ...

If a `[[no_unique_address]]` field has zero size according to Clang, and field has a type that isn't representable in Swift, Swift would previously try to add an opaque field of size 1 for it.

This is wrong and was causing crashes for `std::string` while emitting a padding field:
```
_LIBCPP_NO_UNIQUE_ADDRESS ::std::__compressed_pair_padding<T1> _LIBCPP_CONCAT3(__padding1_, __LINE__, _);
```

rdar://151941799

2025-05-30 17:32:15 +01:00

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