take base class into account when calculating member index

Author: kastiglione

lldb/source/Target/SwiftLanguageRuntimeDynamicTypeResolution.cpp

@@ -1222,9 +1222,11 @@ llvm::Optional<size_t> SwiftLanguageRuntimeImpl::GetIndexOfChildMemberWithName(
       auto tip = LLDBTypeInfoProvider(*this, *ts);
       auto *cti = tc.getClassInstanceTypeInfo(tr, 0, &tip);
       if (auto *rti = llvm::cast_or_null<RecordTypeInfo>(cti)) {
-        if (auto size =
-                findFieldWithName(rti->getFields(), name, child_indexes))
+        uint32_t offset = builder.lookupSuperclass(tr) ? 1 : 0;
+        if (auto size = findFieldWithName(rti->getFields(), name, child_indexes,
+                                          offset)) {
           return size;
+        }
         // TODO: handle base classes.
       }
       return {};