[patch][pr10367] Add support for offsets in GlobalAlias

[Rafael Espíndola]

> I think you should explicitly state that the offset is in bytes.

Good idea. Fixed.

>> +  const APSInt &Val = Lex.getAPSIntVal();
>> +  if (Val.getBitWidth() > 64)
>> +    return TokError("expected a 64 bit unsegned integer");
>
> s/unsegned/unsigned

Oh, on the current patch the offset is signed. I just forgot to update
the error message. I fixed it in the attached version.

Thanks,
Rafael
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