vwithfield and ValueType.findWither

[John Rose]

On Jun 14, 2017, at 2:20 PM, Maurizio Cimadamore <maurizio.cimadamore at oracle.com> wrote:
> 
> Another possible story is that we always create values through the VCC constructor, and then unbox. If we think we're happy with that, that might be a fine choice too.

That's not a bad story for the JIT with aggressive scalarization,
and was my first idea about this, but it is painful in the interpreter.