ignore power alignment rule on unions #147375
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fixes #147348
The power alignment rule only applies to the non-first field of a struct, and so should not apply to unions at all.
The current code also does not consider enums (whose fields might be, morally, structs). Given that C does not actually have ADTs like this it's probably fine from a compatibility perspective, but I'll leave that to the powerpc folks.
cc @daltenty @gilamn5tr
r? compiler