Type.hasCodeGenBits asserts structs and unions have fields
Previously, this function would return an incorrect result for structs and unions which did not have their fields resolved yet. This required introducing more logic in Sema to resolve types before doing certain things such as creating an anonmyous Decl and emitting function call AIR. As a result a couple more struct tests pass. Oh, and I implemented the language change to make sizeOf for pointers always return pointer size bytes even if the element type is 0 bits.
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