RFR(S): 8190935: [MVT] TestMinimalValueTypes fails with ClassCastException

[Roland Westrelin]

> http://cr.openjdk.java.net/~thartmann/8190935/webrev.00/

Looks good to me.

> I've also added a missing case to sharedRuntime_x86_64.cpp which is triggered by nmethod::print_nmethod_labels() ->
> SharedRuntime::java_calling_convention() when using hsdis because T_VALUETYPE may be used in the signature.

Would it be possible to change the caller instead so it doesn't pass
T_VALUETYPE but T_VALUETYPEPTR?

Roland.