SIL: Add an assertion

lib/SIL/ValueUtils.cpp

@@ -20,6 +20,7 @@ Optional<ValueOwnershipKind>
 swift::mergeSILValueOwnership(ArrayRef<SILValue> values) {
   auto range = makeTransformRange(values,
                                   [](SILValue v) {
+                                    assert(v->getType().isObject());
                                     return v.getOwnershipKind();
                                   });
   return ValueOwnershipKind::merge(range);