[llvm] r239590 - LowerBitSets: Give names to aliases of unnamed bitset element objects.

[Rafael Espíndola]

> It is valid for globals to be unnamed, but aliases must have a name. To avoid
> creating invalid IR, we need to assign names to any aliases we create that
> point to unnamed objects that have been moved into combined globals.

I removed that restriction in r239921.

Cheers,
Rafael