[project @ 1999-10-18 11:44:20 by kglynn]

[project @ 1999-10-18 11:44:20 by kglynn]
The fix to ignore error() cases when doing CPR analysis exposed a
problem with the Void type.  A function that always constructs a void
result was converted to w/w, but the worker was producing an unboxed
tuple with 0 components.  Not good.

Fixed so that constructing a void gives CPR value Top.  This is OK
because we won't really be constructing a void each time, we will be
returning a pointer to a shared void cell.