[CIR] Add VTable class name for array types

[MihailMihov]

This PR adds the VTable name _ZTVN10__cxxabiv117__array_type_infoE for Type::ConstantArray, Type::IncompleteArray and Type::VariableArray in ItaniumRTTIBuilder::BuildVTablePointer.

issue #163601

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[MihailMihov]

Currently there is no test for this, as I'm not sure how to test it. In the linked issue, throw was suggested, but I don't think that can work for arrays as they always go through the array-to-pointer conversion. typeid can't be used in the tests and I think it's not implemented in CIR.

The only thing that might work is try/catch. I think this would be a correct test for Type::ConstantArray, but try is not yet upstreamed and I don't think that same idea can be applied for Type::IncompleteArray or Type::VariableArray.