[sv-bc] XMRs in parameter value overrides of module instantiations

According to

    http://www.eda-stds.org/svdb/view.php?id=1058
    http://www.eda-stds.org/svdb/view.php?id=1224

the LRM currently allows the parameter values in module instantiations
to be hierarchical references, for example

    mod#(.P(mod_inst2.P) mod_inst1(...);
    mod#(.P(mod_inst1.P) mod_inst2(...);

Are real users doing this kind of tricky stuff?  How badly would it
break backward compatibility to disallow this starting in 2008?

-- Brad

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