message: Don't crash when pass by value struct has no definition.
diff: @@ -1010,7 +1010,7 @@ TypeSP DWARFASTParserClang::ParseTypeFromDWARF(const SymbolContext &sc,
  if (attrs.calling_convention == llvm::dwarf::DW_CC_pass_by_value) {
  clang::CXXRecordDecl *record_decl =
  m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType());
  - if (record_decl) {
  + if (record_decl && record_decl->getDefinition()) {
  record_decl->setHasTrivialSpecialMemberForCall();
  }
  }
  