[patch] Don't rauw an alias in llvm.used (v2)

[Rafael Espíndola]

> Doxy-strings please! :)

Done.

> +static int compareNames(const void *A, const void *B) {
> +  const GlobalValue *VA = *reinterpret_cast<GlobalValue* const*>(A);
> +  const GlobalValue *VB = *reinterpret_cast<GlobalValue* const*>(B);
> +  if (VA->getName() < VB->getName())
> +    return -1;
> +  if (VB->getName() < VA->getName())
> +    return 1;
> +  return 0;
> +}
>
> Say, what *does* happen if you have unnamed global values?

I tried using SetVector, but it has no erase method. But then again, I
was not even able to write a case where we get an unnamed value in
llvm.used. The attached patch adds this check to the verifier.

Cheers,
Rafael
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