More on type sizes

[Richard Kenner]

Now that I think about it, why do we need TYPE_SIZE *at all*?  The
only place we currently allow a size not to be a multiple of
BITS_PER_UNIT is the DECL_SIZE of a bitfield.  At some point, it would
indeed be nice to support such things as bit-packed arrays, where we
actually *do* have a type whose size is, say, 1 bit, but in that case
what would TYPE_SIZE_UNIT mean?

So I'm even more confused about the basics of what's trying to be
acomplished here.