Part of #27023: Put drop flag at end of a type's representation.

This is trickier than it sounds (because the DST code was written
assuming that one could divide the sized and unsized portions of a
type strictly into a sized prefix and unsized suffix, when it reality
it is more like a sized prefix and sized suffix that surround the
single unsized field).

I chose to put in a pretty hack-ish approach to this because
drop-flags are scheduled to go away anyway, so its not really worth
the effort to to make an infrastructure that sounds as general as the
previous paragraph indicates.

Also, I have written notes of other fixes that need to be made to
really finish fixing #27023, namely more work needs to be done to
account for alignment when computing the size of a value.

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