[lldb][TypeSystemClang][NFC] Clean up TypeSystemClang::GetBitSize (#100674) This patch performs following NFC changes to TypeSystemClang::GetBitSize: * Factor out the Objective-C logic into a helper function. * Introduce a new case for `FunctionProto`. I don't see a good reason for special-casing this in the `default` case. * We had a redundant check for `GetCompleteType` in the `RecordType` case. We used to allow zero-size types for records and function prototypes, so we can just fold them into the same case. * Introduce a new case for `IncompleteArray`. The motivation for this is that there are a few issues around VLAs (i.e., `Type::IncompleteArray`) whose fixes will be easier to reason about after this refactor. Generally I don't think treating a type with 0 size as an error is the right thing to do (at least not for array types). But that's not something I wanted to fold into this NFC change.
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