Remove some redundancy from the DValue hierarchy: all subclasses had a 'type' field and identical implementations of virtual function getType(). Move these to DValue itself, and make getType() non-virtual.

// ireal

module typeinfo1.ti_ireal;

private import typeinfo1.ti_real;

class TypeInfo_j : TypeInfo_e
{
    char[] toString() { return "ireal"; }
}