Correct offset calculation with multiple base classes (#494)

If a class inherits from more than one base class Clang Parser currently
calculates incorrect offsets for everything but the first base class.
This is owing to the fact that TypeGraph needs offsets in bits but
ClangParser is providing them in bytes.

Author: tyroguru

oi/type_graph/ClangTypeParser.cpp

@@ -335,7 +335,8 @@ void ClangTypeParser::enumerateClassParents(const clang::RecordType& ty,
     if (baseCxxDecl == nullptr)
       continue;
 
-    auto offset = layout.getBaseClassOffset(baseCxxDecl).getQuantity();
+    auto offset =
+        layout.getBaseClassOffset(baseCxxDecl).getQuantity() * CHAR_BIT;
     auto& ptype = enumerateType(*baseType);
     parents.emplace_back(Parent{ptype, static_cast<uint64_t>(offset)});
   }