0a3fdd30e5
The NYI diagnostic in getFunctionTypeForVTable showed up a few times in testing, so this patch is attempting to fix that up. The reproducer here is a function type for a vtable that has an incomplete type in it(return or parameter). Classic codegen chooses to represent this as an opaque type. This patch instead removes the special v-table handling here, so that we can instead just represent the types as incomplete record types. At the moment, this patch ends up lowering incomplete types as 'empty' types in LLVM-IR, which we may find we need to modify in the future, however at the moment, it seems to work. This patch ALSO changes the definition of RecordType::isSized to only be true for complete types, which prevents a number of other things from attempting to add attributes/check the size of the type/etc, but those are irrelevant for the purposes of vtable emission.
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