[PATCH] Propagate alignment for _Complex

[JF Bastien]

I've attached an updated patch, and a test. I also updated other tests
which had ``volatile _Complex``.

Two questions:
 - ``align 0`` means "suitably aligned", right? It seems to occur on
stack values, I assume the value gets determined later.
 - What should we do with less-than-naturally-aligned _Complex? It
seems like we should warn instead of silently handling it, same with
atomic. I could do that in a separate patch.
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