LLVM: fix lowering of untagged union types #11966
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The LLVM backend was calculating the amount of padding solely based on the payload size. However, in the case where there is no union tag, this fails to take into account alignment. Closes #11857
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The LLVM backend was calculating the amount of padding solely based
on the payload size. However, in the case where there is no union
tag, this fails to take into account alignment.
Closes #11857