bit_size_type - a data type?

[Florian Weimer]

* Richard Kenner:

>> bitsizetype is a type that can hold any values of sizetype *
>> BITS_PER_UNIT so we can safely do bit-size calculations without overflow.
>> This type shouldn't end up used in code though.
>
> Unfortunately, it does, though not in C.  Ada's 'Size attribute returns
> the size in bits, so the proper type for that computations is bitsizetype,
> though many computations end up being constant-folded.

Ada used a 32-bit signed integer type in this case, limiting object size
to 2**31 bits.  Is this no longer the case?